Spanish-English Medicinal Plant Names for Southwest United States and Mexico
(Emphasis on Plants of New Mexico, U.S.A. & Morelos, Mexico)
with some revisions as of 9/6/2009 by Paul McKee

The Tree of Life Perspective (Plant Genealogy)
Summary; Disclaimer; Purpose; Technical details; History of scientific names; Scientific names; Population or species; Species; Ranks; Species name; Abbreviation sp. or spp.; Subspecies or variety name; Genus name; Genus subgroup names; Family name; Subfamily, tribe subtribe, etc.; Plants, fungi, and animals; Animal kingdom; Two zoological kingdoms; Plant kingdom [photoautotrophs (including some so-called "thallophytes"), eukaryotic plant kingdom, first eukaryotic photoautotrophs, viridophytes, and land plants]; Streptophytes; Fungi names; Fungus kingdom; Fungus-like organisms; Bacteria names; Naming only valid lineages; History of formal and informal names; Plants first studied; Bio-historic perspective; Polyphyletic or paraphyletic groups; Plant classification system proposed by Eichler (1886); Plant classification system proposed by Conquest (1960); Cryptogams; Thallophyta and Algae; "Algae" classification; "Algae" relationships; Multicellular versus unicellular organisms; Microbial life (including some alveolates); Eukaryotes versus prokaryotes; microorganisms versus macroorganisms; Quick overview of Tree of Life (Three Domains, Eubacteria, and Eukaryota); Problems with ranks; Limitation of ranks; Optionality of ranks; Botany; Medicinal genus; Synonyms (and comments on equal sign); Check-lists; Up-to-date family names; Example; Vascular plant families in New Mexico [Family Asteraceae in New Mexico (comparing New Mexican genera with those used medicinally in Morelos) and summary of uses]; Organization; Medicinal uses; Sacred medicinal knowledge and preservation of traditional medicinal knowledge; Approach; Related fields of study; Characters or traits; Appendix; References

".... the beginning of every science is the description and naming of phenomena.
Human beings seem to have an instinct to master their surroundings that way.
We cannot think clearly about a plant or animal until we have a name for it ...."
-- From Prologue: A Letter to Thoreau, quoted by
Wilson, E. O. (2002) The Future of Life, New York: Alfred A. Knopf Press.

This dictionary is a work in progress. It attempts to list all medicinal plant resources that can potentially be found in the medicinal flora of the Southwest USA and Mexico by mostly English, Mayan, Nahuatl, and Spanish vernacular (common) names, linked (whenever possible) to the most up-to-date scientific names. There is an initial emphasis on the medicinal floras of the states of New Mexico and Morelos. Linked to this dictionary are other web pages (also works in progress) that can eventually serve as a botany resource for herbalists. This project attempts to provide a global prospective on medicinal resources with a focus on specific geographical regions. Medicinal floras are defined here to include not only plants with recorded folk uses in specific geographical regions. It also includes native or introducted and naturized plants closely related to plant resources that are known to be used medicinally or tested for medicinal potential elsewhere (anywhere in the world), even when there is no known record of use in the specific geographical regions of emphasis in North America (including New Mexico and Morelos). This global prospective attempts to call to attention the plants of the specific regions that are closely (phylogenetically) related to plant resources with similar uses for similar health conditions especially in independant regions of the world. Although the dictionary itself is only an alphabetical listing of medicinal resource names, the scientific naming of the included life forms considered medicinal resources and all the names (scientific or vernacular) are in the process of being linked to information helpful in identification based (as much as possible) on phylogeny. The medicinal attributes discussed in the linked web pages to the dictionary can eventually be mapped onto phylogenetic tree-like diagrams to explore in more detail their distribution in specific named or unnamed lineages.

With an emphasis on medicinal plants that grow in New Mexico and parts of Mexico, especially Morelos, this dictionary links any common name (also called a vernacular name) to all the scientific names that were found to apply to it, while a given scientific name is linked to all common names that were found to apply to it. Whether a common or scientific name of a plant or a name of a natural medicinal oil, extract, clay, animal part, etc., each entry is in alphabetical order according to the first word in its paragraph. The same applies to the name of some compound situation (as a name for a formula of several plants or other materials) that may require one or more short definitions covered in other web pages linked to the dictionary. For an example, chick out all entries that apply to the plant genus Achillea, including scientific and common names for all its species in New Mexico. When BONAP is cited, following a scientific name, it can be assumed that the plant involved grows in North America north of Mexico. If a scientific name applies to a plant that grows in New Mexico, this will be indicated by the phase "In New Mexico" placed in the paragraph that begins with the scientific name of the plant group. When the scientific name is followed by '(?)', this indicates that the name is not listed in BONAP or its author has not yet been found in any other regional check-list of up-to-date plant scientific names. Reference sources of names are cited as abbreviations or key words in parentheses that indicate geographical region, ethnic group, or language (e.g., BONAP, NM, Upper Rio Grande Valley, Maya, Mexican-American, and Nahuatl). For common names, Aztec (Nahuatl), English, Mayan, and Spanish names are included (as they are applied in Southwest United States and Mexico). The few names from other Native American languages are included, only if commonly employed by Spanish or English speakers. In this dictionary, there is an emphasis on plant names of New Mexico in USA and Morelos in Mexico. However, plant names (when found) from the state of Arizona, as well as the entire southwestern United States, are also being added to the dictionary. Although medicinal plant names from Morelos are emphasized, names of potential medicinal interest from any part of Mexico (as found) are being added.

The information provided here or elsewhere by this author does not recommend self medication or the use of unproven folk remedies. It is provided solely as an educational resource for serious practitioners or those that are interested in a scientific approach to the study of herbal medicine.

The definition of lineages of organisms or the relationships between these lineages is based on the consenus of multiple molecular phylogenetic analyses by various authors involving as many genes as possible. Brief discriptions for well-supported vascular and flowering plant families in New Mexico, using family names according to APG I, APG II, APG III, and APG IV, will eventually be covered in another web page. This web page will also include descriptions of families of other seed plants, ferns, and lycopsids. It is recommended that these relatively short descriptions should be used as an aid for anyone interested in learning how to recognize the important vascular plant families of New Mexico that contain known natural medicinal resources. The ability to narrow down any plant to its family can greatly facilitate accurate plant identification. These descriptions will be linked to the family names that appear in the dictionary and a glossary of terms for plant forms or structures that can help distinguish the families will be included. Accurate identification of organisms based (whenever possible) on a combination of easily observable characteristics of forms or structures that can help to mark lineages is also emphasized. For native or introduced medicinal vascular plants found growing wild in New Mexico, there is an attempt to provide complementary information that is consistent with Flora Neomexicana IIIa: Field Keys by Kelly W. Allred (2012). This light weight, condensed, and inexpensive paperback book is recommended for any one interested in learning how to identify the native (or introduced but naturalized) medicinal plants in the field (in the wild) that are listed in this dictionary as present in New Mexico. Flora Neomexicana including other books is cited here as NM.

The pages that will eventually be linked to the dictionary are included in an attempt to provide a scientific botany resource for those that are serious about their use of local medicinal herbs in healing. This information is not intended for those that are unwilling to undergo the rigorous study of plants that was once required to become a well trained pharmacist or physician. For example, all schools of pharmacy once required students to study pharmacognosy, the knowledge of mostly natural drugs and their chemical constituents. Just because modern pharmacists or physicians are no longer required to learn these skills (due to the heavy reliance on modern synthetic pharmaceutical drugs) does not mean that the local healers that employ only natural remedies should be deprived of scientific training that could serve their needs and enhance their credibility. This is especially important when certain alternative natural remedies can be shown scientifically to be more effective and with less side effects than certain modern conventional synthetic drugs used for the same conditions. For example, see Lomatrol. Contrast this with the dangers of highly concentrated alcohol extracts containing thujones and possibly unknown toxic chemicals. Despite increasing and still growing interest and use of natural remedies from plants by the general public for nearly 50 years, some universities still do not generally support any scientific study of these living resources in biology departments or even schools of pharmacy and medicine. With USA health care reforms in the making, it should be interesting to see whether some of these presently persistent attitudes change. The nature derived bioactive chemical compounds (produced by living organisms) are still being researched, especially as medicinal chemists begin to run out of novel leads for chemical synthesis of pharmaceuticals.

Partly due to discouragement or lack of support for the scientific study of herbal medicine for much of the 20th century (especially in the USA), some of the information presented here (e.g., the discussions on plant classification and scientific names) may at first appear too technical for the average individual interested in medicinal herbs. However, if the reader concentrates closely on what is written and (when necessary) follows some of the links, the average person should be able to "digest" the big words and understand the technical details. The traditional conventions for formally naming plants are (at least to this author) very boring (often left out of general biology textbooks), so a short historical account is included here to hopefully help make this topic more interesting. The compilation of scientific names, synonyms, and even vernacular names for a large number of medicinal plants can also be a very tedious process, so additional pages are to be eventually linked to add educational substance to the dictionary. The mere listing of names can provide a tool only when linked to additional information useful to, for example, accurate plant identification. The application of an overall, more interesting approach for doing all this, based on the genealogy of plant lineages, is (whenever possible) emphasized here. Therefore, the reader should be informed that the use of plant genealogy is employed by this author as the most important means of collating vernacular names with scientific names. In other words, each vernacular name is linked to one or more scientific names and the scientific names are linked to the major lineages of the organisms bearing these names. Additional details (including shared derived characters, medicinal properties that correlate with genealogy, and other information useful in describing the major lineages associated with the scientific names) are provided in the web pages that will eventually be linked to the dictionary. This summary, including this page and an appendix, can be considered a preface to the dictionary and the eventually linked pages. However, it has been made extensive enough to have value in itself as an introductory educational resource for herbalists. To add more flavor, an additional page on the likely prehistoric use of the medicinal genus Artemisia L. has also been included for optional reading. These web pages will continue to be revised as the dictionary and pages linked to it are developed. Hopefully, an initial linked version of the dictionary will become available on this web site soon. In the mean time, please feel free to periodically check out this web page. The information provided by this introductory summary is extensive enough that it can be studied to prepare the reader for what will eventually be added to this web site.

The terms used even to this day to describe plant characteristics (especially morphological structures) have largely descended from those originally used by ancient herbalists (when the study of plants and medicine were once united). As late as the first half of the eighteenth century, Latin names constructed of short descriptions useful for identification were relied upon to keep track of the growing number of known plants of interest to the then closely associated fields of botany and medicine. For example, the medicinal properties of the plant commonly called belladonna were widely known to Europeans since medieval times. According to Sumner (2000), the formal name for belladonna was atropa caule herbaceo, folis ovatus integris, which can be translated as "the atropa with stems herbaceous, leaves egg shaped, leaf margins entire." The term "herbaceous" means green and non-woody, while the term "entire" applies to smooth leaf margins with no indentations or lobes. (The terms "woody" versus "non-woody" or "herbaceous" can have a chemical basis.) As the number of these plants increased due to world exploration, such formal names called polynomials began to comprise longer and longer descriptive Latin phases. This became an aid for the identification of specific variations in the members of related groups of plants. With the introduction of binomial nomenclature by the Swedish botanist Carl Linnaeus, a system of naming species that has survived almost 250 years, the long descriptive polynomials were eventually replaced by formal names called binomials, composed of only two words. For example, the polynomial for one of the common buttercups was Ranunculus tripartitis foliis peltatis quinquangularibus multipartitis laciniis linearibus caule multifloro. Linnaeus shortened this many worded name to the two worded name Ranunculus acris. Many ancient Greek words still in use were preserved by Linnaeus as the single word names for groups called genera (plural for genus) of similar and (ideally) very closely related species. Despite the shortening of the formal names to one or two words, they often remained descriptive and often corresponded to distinctive characteristics useful in identification.

  • Sumner, Judith (2000) The natural history of medicinal plants, Timber Press, Portland, Oregon.

    Today, scientific names (also called formal or taxonomic names) are (ideally) universal symbols (accepted internationally) in Latin and/or Greek for groups of living (or fossil) organisms that should (ideally) correspond to particular lineages. The rules for formally naming plants, including "algae" and fungi or any other type of organism traditionally treated as plants, are based on rules and recommendations of the International Code of Botanical Nomenclature or ICBN. There is a somewhat different code for cultivated plants. These are rules that help to ensure only one correct scientific name, the earliest published name, for a particular well circumscribed group of organisms. The earliest published names always have priority over other names except in certain specified cases, especially those cases involving revisions of groups, bearing older names, that are not well circumscribed (e.g., artificial groups that do not include true lineages). More modern approaches stress the need of applying formal names (whenever possible) only to well defined lineages. Scientific names are always composed of one or more Latin or 'Latinized' words. A legitimate scientific (taxonomic) name representing some group that is less inclusive than a kingdom and more inclusive than a genus should be based on the taxonomic name of some genus. Although the names, themselves, are much shorter than the old polynomials used prior to Linnaeus, in order to validly publish a new scientific name, this name must be accompanied by an often brief Latin diagnosis, which is one or more sentences in Latin describing the diagnostic (distinguishing) features useful for the identification or the circumscription of the plant or group of organisms so named. A name published with a Latin diagnosis has priority over a prior name published without such a diagnosis. Since the species is considered the fundamental taxonomic unit or category (the most basic one or the lowest-ranking normally used one), an attempt will be made to define this group first. On the basis of this definition, other more or less inclusive groups are then defined. Some rules for the names of species and other groups are discussed. However, this is done only after the reader is given a introductory explanation of the species as the most basic unit of classification.

    Although a species can be defined in several ways, one of the most common definitions is that a species is a distinct lineage that, in sexually reproducing organisms, comprises a group of generally very similar looking, interbreeding populations that are (one way or another and more or less) reproductively isolated from other such groups. According to Ernst Mayr, biological species are "groups of actually or potentially interbreeding natural populations, which are reproductively isolated from other such groups." A population is then a group of individual organisms of the same species usually found in a specific geographical area that are typically capable of interbreeding. The minimum requirement for biological species is that they must be populations of individual organisms capable of potentially interbreeding and producing viable, fertile offspring. Although they may all look more or less alike, this is not enough to qualify as a member of the same biological species. They must all (with the obvious exception of sterile members) be potentially capable of breeding with each other (= interbreeding) to produce another generation of similar creatures. On the other hand, individuals of opposite sex from two populations belonging to different biological species are considered reproductively isolated from one another, because even though they may live in close contact or not, if they are brought together and attempt to breed, they cannot produce fertile offspring.

    The definition of species (singular or plural) can be first attempted according to the biological species concept, which can apply only to sexual organisms that undergo descent by sexual reproduction. Although a species is usually always considered a distinct lineage, other criteria, referred to as the cladistic or evolutionary species concept, ecological species concept, phenetic species concept, recognition species concept, etc., can be applied to asexual organisms (with only descent by asexual reproduction) or those sexual organisms that are distinct enough to be considered separate species but that do not fit the biological species concept. In other words, a species may or may not correspond to the biological species concept. If it does not correspond to a biological species, its distinction as a species can be based on various other definitions. Such issues will be addressed in more detail by the pages that will be eventually linked to the dictionary. For the scientific name of a species, see species name.

    The preoccupation of naturalists (today considered biologist) in the late eighteenth and early nineteenth centuries was the classification of the huge diversity of living organisms into groups called 'taxa.' The species defined to include members capable of interbreeding became the basic unit of classification. However, in cases where it was difficult or impossible to demonstrate interbreeding, the definition of a species was based entirely on similarity of morphology. It was soon discovered that some of the different species groups (although not capable of interbreeding with each other) were so similar that they could be placed into more inclusive taxa such as the 'genus,' which became a member of a 'family,' included as a member of an 'order,' included as a member of a 'class,' included as a member of a 'phylum' or 'division,' and finally included as a member of a 'kingdom.'

    In land plants, scientific names can apply to named groups, including one kingdom (composed of divisions), divisions (each composed of classes), classes (each composed of subclasses or orders), orders (each composed of suborders or families), families (each composed of subfamilies, tribes, subtribes, or genera), genera (each composed of subgenera, sections, series, or species), and species (each composed subspecies, varieties, or forms, including populations often without names). This arrangement of names can be said to correspond to what is called a hierarchical structure of levels (similar in some ways to the older systematic arrangement of organisms attributed to Carl Linnaeus). Levels (at least the principal ones, including a kingdom, divisions, classes, orders, families, genera, and species) are said to be hierarchical, because each one includes all the other ones beneath or (as represented here) following it. Traditionally these levels have been referred to as ranks. Any individual plant can be said to belong to one and only one named kingdom, division, class, order, family, genus, and species. Since populations of the same species are not necessarily reproductively isolated from each other, an individual organism can also be said to belong to at least one or possibly more populations. It can sometimes be said to belong to one and only one named subclass, suborder, subfamily, tribe, subtribe, subgenus, section, series, subspecies, variety, or form, depending on whether these levels are defined. See example of the different ranks (based on lineages) for the medicinal genus Artemisia up to the level of order.

    The species [including one or more populations (sometimes also including designated subspecific groups (= infraspecies), such as named subspecies, varieties, forma or races)] is considered the fundamental taxonomic unit or category that is below the level of the genus. The species name is represented by two words that are italicized or underlined (e.g., the species name for corn: Zea mays), sometimes followed by the author(s) of the name. Note that the first letter of the first word of the species name is capitalized, while this is usually not done for the second word. Some older species scientific names can be found that capitalize the first letter of both words (especially when the second word is derived from a proper name), but this is usually never done today. The scientific name of a species is called a binomial or binominal, since it has two parts, a capitalized generic name (same name as the genus), followed by an uncapitalized species epithet. The binomial for the species name is always composed of two Latin or 'Latinized' words. Although the rules for the endings of each of these words and other issues are not treated here, it might be worth mentioning that the two worded species name is treated as a Latin singular noun. This is also the case for names at or below the rank of genus. Only those names above the rank of genus are treated as Latin plural nouns. See a few further comments on the history of what is called binomial nomenclature (the formal method of naming species). Sometimes the author(s) of the binomial are optionally included after the species epithet [e.g., the full name (including authorship) for Zea mays is Zea mays L.]. This author(s) designation, often only abbreviated, is capitalized but never italicized or underlined.

    When species are intentionally not completely identified, the abbreviation 'sp.' in the singular or 'spp.' in the plural, following the generic name, is used without reference to any species epithet. Only the generic name with the first letter capitalized is italicized. For example, in the particular genus for pines, Pinus sp. or Pinus spp. applies to a single unidentified species or several but not all species, respectively. Therefore, the abbreviation 'sp.' applies to individuals belonging to a particular genus but the exact species remains unidentified, while 'spp.' applies to at least some but not all species within this genus. If it applies to all species within a genus, the generic name by itself is used.

    In naming subspecies or variety (examples of subspecific groups), the two worded species name comes first and, next, the so-called epithet for the subspecies or variety follows the abbreviation, ssp. or var., with the author(s) of only the subspecies or variety epithet sometimes (optionally) included last. Of course, the abbreviation, ssp., corresponds to subspecies, while the abbreviation, var., represents variety. Again (as above), only the first letter of the first word of the italicized or underlined species name is capitalized. The single worded subspecies or variety epithet is italicized or underlined, but its first letter is not capitalized. The epithets, no matter what rank, are usually never capitalized. The only words that are italicized or underlined apply to the two worded species name and the single worded subspecies or variety epithet. Therefore, for the species and lower ranking groups, only the generic name and one or more epithets are italicized or underlined. The rest of the words in the scientific name are not italicized or underlined and apply to an abbreviation, ssp. or var., and (if included) the often abbreviated author(s) of the subspecies or variety epithet. Since there are three italicized or underlined Latin or 'Latinized' words, a subspecies or variety name is called a trinomial (meaning three names). See example for some variety names of the medicinal species Achillea millefolium. Also included is a fairly complete list of the varieties of this species found in North America. The author(s) of the two worded species name can be optionally included in addition to the author(s) of the subspecies or variety epithet. When this is done, the author(s) of the species directly follow its two worded name and the author(s) of the subspecies or variety directly follow its single worded epithet. Although subspecies and variety are sometimes used interchangeably, subspecies is technically ranked at a higher level than variety, which means that a subspecies can include two or more varieties. This can result in a name for a variety being composed of four italicized or underlined words (a quadrinomial, meaning four names). In this case, author(s) can be included directly after the two worded species name, other author(s) directly after the subspecies epithet, and still other author(s) directly after the varietal epithet. Often only the author(s) for the varietal epithet are included. Of course, the abbreviation spp. comes directly before the subspecies epithet and var. directly before the epithet for variety.

    A genus is usually considered a group of very closely related species, each of which can be composed of more than one subspecies or variety. A genus name is the first word of any of its species names, including infraspecific names for subspecies, variety, or forma. In other words, all member species of a genus are distinguished by the second word of their scientific name and have the same first word called the genus name. Subspecies or varieties of a given species of a genus have the same two worded (italicized) species name and are distinguished by the third or even fourth (italicized) word in their names. Therefore, the name of a genus is always a single, italicized or underlined word with its first letter capitalized (e.g., the genus name for corn: Zea). The often abbreviated author(s) of the genus name are optionally placed at the end of the name [e.g., the full name (including authorship) for the genus Zea is Zea L.]. Again, some of the older names for genera (plural for genus) were often derived from or identical to old Greek names for groups of (ideally) closely related species. This is consistent with ICBN rule of priority of the earliest names. Only after a genus name is at least completely spelled out [with or without its author(s)], so that it cannot be confused with any other genus name, can a genus name be abbreviated by the capitalized first letter followed by a period. Thus, the species for corn can be abbreviated as Z. mays, only after Zea has been spelled out in full.

    When a subgroup called a subgenus, section, or series of a genus is sometimes defined, the name of each subgroup can have various endings. Often (but not necessarily) a subgenus can be named by a capitalized species epithet, comprising all the species that are ideally most closely related to the one bearing the species epithet; and only one of the subgenera (plural for subgenus) bears the same name as the entire genus. For example, the two subgenera for the genus Equisetum are Equisetum subgenus Equisetum and Equisetum subgenus Hippochaete. Note that the subgenera names (Equisetum and Hippochaete) are also italicized. In this example, the subgenus Hippochaete is not a capitalized species epithet of any of its species, but the subgenus Equisetum has the same name as the entire genus. The medicinal species with scientific name Equisetum arvense is commonly referred to (in Spanish) as Cola de caballo. It belongs (along with certain other species commonly designated in English as "Horsetails") to Equisetum subgenus Equisetum. The medicinal species with scientific name Equisetum hyemale is commonly referred to (in Spanish) as Canutillo del llano. It belongs (along with certain other species commonly designated in English as "Scouring rushes") to Equisetum subgenus Hippochaete. See also short mention of two subgenera for Wormwood and Mugwort. Examples of published names for sections or series (when defined) will not be given here, but the reader should be aware that sections are subgroups (made up of species) placed within subgenera; and series are subgroups (also made up of species) placed within sections. Of course, authors of all these names can again be optionally included after the italicized part.

    A family can be thought of as a group of closely related genera (plural for genus). The family name is a single word ending in the suffix -aceae (e.g., Poaceae). The Grass family is called Poaceae; the Sunflower family is called Asteraceae; and so on. For example, the genus Zea (for corn), including one of its species Zea mays, is in the family Poaceae, while the genus Achillea (for yarrow), including one of its species Achillea millefolium, is in the family Asteraceae. The often abbreviated author(s) of the family name are optionally placed at the end of the name [e.g., the full name (including authorship) for the family Poaceae is Poaceae (R.Br.) Barnh.]. Although there is a trend today to use the suffix -aceae for all family names, the reader should be aware of eight alternative family names that do not end in this way. These include Compositae (= Asteraceae), Cruciferae (= Brassicaceae), Gramineae (= Poaceae), Guttiferae (= Clusiaceae + Hypericaceae), Labiatae (= Lamiaceae), Leguminosae (= Fabaceae), Palmae (= Arecaceae), and Umbelliferae (= Apiaceae). Most of these are old family names that represent groups of plants that may have been recognized since ancient times. These alternative names are often used in older but sometimes even more modern works on plant taxonomy. Although the scientific names for species (including epithets for subspecies, varieties, or forms) and genera (including epithets for subgenera, sections, and series) should always be in italics or underlined, this practice is optional for the family names (including those of subfamilies, tribes, and subtribes), as well as order, class, and division names. The single word names for these more inclusive taxonomic units are usually not underlined or italicized. However, as in the family Poaceae (R.Br.) Barnh., the often abbreviated author(s) of the single word name of the more inclusive group can optionally be placed at the end of the name.
    The practice in recent editions of the ICBN Code is to place all scientific names regardless of rank in italic type. This author still adheres to the old standard of italicizing scientific names at or below the rank of genus, but only optionally places names above the rank of genus in bold type, especially when the formal names represent well supported lineages (e.g., many current names for orders of flowering plants).

    A family can be subdivided into subfamilies and tribes. If subfamilies are defined, they can sometimes be subdivided into supertribes or tribes. By convention, the subfamily name ends in the suffix -oideae, while the supertribe name ends in the suffix -odae and the tribe name ends in the suffix -eae (subtribe names end in the suffix -inae). For a few examples of names for such family subdivisions, see family tree for the Lamiaceae (scientific name for what is commonly called the mint family). Families can be grouped into superorders (with suffix -anae) or orders (with suffix -ales) and orders into classes (with suffix -opsida or in "algae", -ophyceae). Orders comprising families can also be subdivided into suborders (with suffix -ineae) and classes comprising orders can be subdivided into subclasses (with suffix -idae). A division (= phylum) or a subdivision (if defined) is a group of classes. A division name ends in the suffix -phyta. A subdivision (below a division) ends in the suffix -phytina. A kingdom name can have various endings. Again, a legitimate scientific (taxonomic) name representing some group that is less inclusive than a kingdom and more inclusive than a genus should be based on the taxonomic name of some genus; and often abbreviated author(s) of these names are optionally placed at the end of the names. Kingdom or domain (superkingdom) names are not necessarily based on a taxonomic name.

    Going back in history at least as far as the ancient Greeks, living organisms were classified as either animals ("Animalia") or plants ("Plantae"). Aristotle (384-322 BC) concerned himself mainly with animals, more or less defining them as organisms that can move from one place to another and possess a "soul" with sensory and perceptive capability. On the other hand, plants were more or less defined as all other organisms (everything else or the residuum = the "left over organisms") that (like animals) possess bodies, nutrition, and reproduction but that cannot move about and lack sensory and perceptive capability. As a residuum, plants included fungi (see next paragraph) or anything else that could not be considered an animal. Therefore, biology eventually became the study of life or living creatures that were considered either animals or plants; the study of animals was called zoology versus the study of plants called botany; and the fungi were considered unusual plants placed among the "crytogams" ("plants" other than seed plants). This is why people that study fungi (a field now called mycology) are sometimes still institutionally placed in botany departments.

    In the eighteenth century, Linnaeus popularized the idea (Lemery, 1675) that nature can be divided into three kingdoms, mineral, vegetable (plant) and animal. N. J. de Necker may be the first recorded to propose the separate status of fungi as early as 1783. Although the rules for naming both plants (e.g., mosses and marigolds) and fungi (e.g., molds and mushrooms) are still dictated by the ICBN Code, it was decided by R. Villemet (1784) that fungi are unique enough to be placed in their own kingdom separate from plants. At that time period, only three kingdoms of life were sometimes recognized, corresponding to plants, fungi, and animals. Even though a three kingdom system had already been proposed, the older two kingdom system, including only plants and animals, considering fungi as unusual types of plants, was still widely used well into the early part of the 20th century. Actually, a separate kingdom for fungi was not generally accepted until the proposals of Whittaker (1959) for the five kingdom system, dividing all life into the kingdoms of animals, plants, fungi, "protists" and "bacteria." In the two kingdom system of classification of the early 20th century, the plant kingdom was roughly defined to include (1) "Thallophyta" ["algae," including "chromistan algae," as well as what was once called blue-green algae (= class Cyanophyceae), "bacteria" (= "Monera"), fungi, "lichens" and "fungus-like organisms")], (2) "Bryophyta" (liverworts, mosses, and hornworts), (3) "Pteridophyta" [ferns and "fern allies" (often including horsetails and lycophytes)], and (4) Spermatophyta (seed plants, including flowering plants). Biology still includes the two major divisions of botany and zoology. At the time that the rules for naming organisms were codified in the late 19th century, there were only two Codes: one for animals and the other for what were called "plants."

    Irrespective of whether a two or three kingdom system of life, the animal kingdom often referred to as Metazoa Haeckel has remained over the years of the 20th century relatively stable (with only a few variations in the names of certain major groups). It has comprised for a long time at least the major phyla of multicellular organisms, such as Porifera (sponges), "Coelenterata" (sea anemones, jelly fish, comb jellies, etc.), Platyhelminthes (flatworms), Nemathelminthes (roundworms), Mollusca (molluscs), Annelida (segmented worms), Arthropoda (insects, spiders, etc.), Echinodermata (star fish, etc.), and Chordata (sea squirts, lancelets, vertebrates, etc.). However, sometimes (prior to the 20th century), the "animal-like group" often called the "Protozoa" (Owen, 1858) that consists mostly of single cells (Von Siebold, 1845) was (at least traditionally) considered part of the animal kingdom. Although Owen is often considered the first to propose the name "Protozoa," Goldfuss (1820) introduced this name first in 1817. This was initially a newer name for microscopic "animal-like" organisms once referred to as "Infusoria" (a name that was later applied just to the ciliates). Haeckel (1866) defined "Protists" or "Protista" (currently used mostly as vernacular name for a polyphyletic grade) as consisting of only "unicellular (single-celled) organisms," many of which are now known to group in various unrelated kingdoms. Haeckel's proposed "Protista" originally merged the large (mostly) unicellular kingdom later called "Monera" (= "bacteria" - "prokaryote organisms" with absence of a well defined nucleus) together with several unrelated (mostly) unicellular (microbial) groups later recognized as eukaryotes (organisms with a well defined nucleus). Haeckel (probably the first to propose the term 'phylogeny' for the evolutionary history, including genealogy, of organisms) defined his tree of life as comprising three major branches, which he called the kingdoms Animalia, Plantae, and "Protista." Even though he grouped all heterotrophic "bacteria" along with, for example, "amoebae" and sponges in "Protista" and cyanobacteria (blue-green algae) in "Plantae", he thought that his three kingdoms were actual lineages. Later he moved "amoebae" and sponges to "Animalia."
    Before "Protista" for single celled organisms was proposed by Haeckel (1866), living organisms were more or less still generally considered to comprise only the two kingdoms of animals and vegetables, even though Necker and Villemet had already proposed a distinct kingdom for fungi or Goldfuss and Owen had already placed unicellular organisms (e.g., "bacteria" and "amoebae") in a distinct kingdom "Protozoa." Apparently, the distinction between "bacteria" and "unicellular eukaryotes" had not yet been recognized. However, eventually Cohn (1875) proposed the name "Schizophyta" for all "bacteria" as distinct from all eukaryotes. This foreshadowed the still widely employed division of all living organisms as "prokaryotes" versus eukaryotes. Another modern but obviously artificial division of all life is "macroorganisms" versus "microorganisms" ["animals + land plants" versus all "left-over organisms" (including viruses) that are neither land plants nor animals). Today, the name "Protista" (or "protists") is often reserved for unicellular or multicellular "algae" plus mainly unicellular "protozoa".

  • Cohn, F. (1875) Untersuchungen uber Bakterien II. Beitr. Biol. Pflanzen. 1, 141-207.
  • Goldfuss, G. A. (1820) Handbuch der Zoologie, vol. 1. Nuremburg, Germany: Schrag.
  • Haeckel, E. (1866) Generelle Morphologie der Organismen. Reimer, Berlin.
  • Lemery, N. (1675) Cours de Chymie contenant la maniere de faire les operations qui sont en usage dans la medecine, par une methode facile avec des raisonnements chaque operation, pour l'instruction de ceux qui veulent s'appliquer a cette science. Lemery, Paris.
  • Necker, N. J. de (1783) Traitesur la mycitologie ou discours historique sur les champignons en general, dans lequel on demontre leur veritable origine et leur generation ; d'ou dependent les effets pernicieux et funestes de ceux que l'on mange avec les moyens de les eviter. Matthias Fontaine, Mannheim.
  • Owen, R. (1858) Palaeontology. Encyclopedia Britannica (8th edn.) (ed. T. S. Traill), Vol. 17, 91-176. Edinburgh.
  • Villemet R. (1784) Essai sur l'histoire naturelle du champignons vulgare, Nouveaux Memoires de l'Academie de Dijon, 2d ser., 195-211.
  • Von Siebold, C. T. (1845) Lehrbuch der Vergleichende Anatomie der Wirbellosen Thiere. Heft 1. pp. 10-11. Viet ­ Comp., Berlin.

    Although certain so-called "protozoan" organisms like choanoflagellates and ichthyosporeans (= mesomycetozoans, corallochytrids, and also perhaps eccrinids) are now considered to have a closer relationship to animals than any other major group (see animal side of neozoan tree), the "Protozoa" (literally, "first animals") are today considered an artificial kingdom of mostly unrelated, single-celled organisms distinct from all animals, as well as "bacteria", fungi, and plants. Nevertheless, at least as far as the rules for formal names are concerned, most "Protozoa" and animals are still considered the two zoological (animal) kingdoms. Consequently, the names of both "animal-like protozoans" and the animals, themselves, are subject to the International Code of Zoological Nomenclature or ICZN. This is still the case, even though the members of "Protozoa" are now placed in various (often unrelated) phyla currently considered separate from multicellular (many-celled) animals. As a collection of generally unrelated organisms, the "animal-like protozoans" have retained many characteristics that were likely present in some of the first eukaryotes (literally, the entire group of organisms that possess a 'true nucleus'). Most are ancestrally unicellular (single-celled) or plasmodial [with many nuclei (plural for nucleus) not partitioned into individual cells], often motile (able to move from place to place), heterotophic (non-food-producing and depending on other organisms for food), phagotrophic (often phagocytic), sometimes osmotrophic, sometimes forming colonies of loosely interdependent single cells, but predominantly non-filamentous (usually never elongated filaments several cells long and one or a few cells wide), lacking protein called collagen, and cell walls usually absent (but if present, not composed of any chitin). In contrast, animals are considered heterotrophic, phagotrophic or sometimes osmotrophic, always multicellular (many-celled) eukaryotes with intercellular (between cell) connections called gap junctions, lacking cell walls or spores, possessing fibrous proteins (mostly collagens) that forms a matrix of connective tissue between the cells, and ancestrally (?) with hallow spherical blastula stage larvae [fertilized eggs or zygotes of some sponges developing into loosely multicellular larvae that at least resemble hallow spherical collections of cells called blastulae, but (unlike other animals) each cell facing the outside bearing a single whip-tail-like flagellum for propulsion or motility and dispersal of larvae].

    The lineage named Metazoa Haeckel is presently sometimes defined as the more inclusive group of animals, comprised of Porifera Grant (= Parazoa Sollas), Trichoplax von Schultze (= Placozoa Grell), Mesozoa van Beneden, and Animalia Linnaeus (= Eumetazoa Butschli, containing Myxozoa Grasse that is secondarily reduced to small number of cells). Some of the major diagnostic characters have already been listed above for organisms that most people would consider animals. The Eumetazoa possess heterotrophic nutrition that often involves phagotrophy [= ingestion; e.g., eating by the swallowing (whole or in pieces) of organisms (or their dead remains called detritus)] with secretion of digestive enzymes and sometimes osmotrophy (~= absorption) through a digestive tract. The activities of the many cells (organized as true tissues, often involving tissue systems, organs, or organ systems) of Eumetazoa are controlled and coordinated via elaborate signal transduction pathways (cascades of sequential biochemical events, often culminating with the expression of genes) that can be thought of as responses initiated often by plasma membrane (cell-surface) receptors proteins that selectively bind to specific ligands (other substances that act as external signal molecules). In other words, as a consequence of the binding of a ligand by a cell membrane receptor protein, the transfer of a signal through a series of intermediate molecules (collectively called a signal transduction pathway) can take place until final regulatory molecules, such as protein transcription factors that regulate gene expression, are modified in response to the signal. Although signal transduction pathways can be found in almost all organisms, especially those with multicellularity, the more elaborate pathways are more common in animals. The consideration of these often more elaborate signal transduction pathways found in Eumetazoa are important to the understanding of natural medicinal resources, because the characterization of such events is, for example, basic to the understanding of how bioactive, medicinal chemicals, or toxins (often acting as ligands) affect the living processes of the cells of these organisms; and such substances can play a critical role in ecological relationships between animal primary consumers and plant primary producers. Generally, many of these substances (potentially produced as allelochemicals by almost any type of organism) are now viewed as important in ecology in the establishment and maintenance of interspecific relationships. Plant versus animal interaction may be a major reason why certain plants possess chemicals with properties of interest to medicine. See also defensive compounds in plants.

    Classification systems of plants that start at the rank of kingdom may differ widely depending on what groups of organisms are considered plants. This can result in differences in names, especially the parts of the names called suffixes, due to different ranges of organisms included in the ranks from one classification to the next. This problem is more directly discussed below. However, in this section on the plant kingdom, there is an emphasis on various ways of defining what is commonly referred to as "plants." When consulting the medicinal plant literature, the reader should pay close attention to how the organisms called "plants" are defined. Some of the major ways of defining what are called "plants" are here summarized by the topics that follow on photoautotrophs, photoautotrophic eukaryotes, first eukaryotic photoautotrophs (??), viridophytes, streptophytes, and embryophyte land plants. Some authorities that would like to restrict their study of 'plants' to embryophytes distinguish what they call 'plant science' from botany.

    The process of photosynthesis can be defined as conversion of light energy usually from the sun into chemical energy by using carbon dioxide (CO2) as the sole inorganic carbon source for organic food production. Any organism that produces food (e.g., sugar) by using (1) light as its energy source, (2) some inorganic compound [e.g., ferrous iron (Fe++), hydrogen sulfide (H2S), hydrogen gas (H2), water (H2O)] as its electron source, and (3) CO2 as its sole carbon source can be considered a photosynthetic organism, which is also called a photoautotroph (or photolithoautotroph). Any organism that cannot use CO2 as the inorganic carbon source to produce (its own) organic food is called a heterotroph (essentially not a food producer but a consumer), while any organism (whether photosynthetic or chemosynthetic) that uses CO2 as the carbon source for food production is called an autotroph. If the process of photosynthesis takes place by absorbing carbon dioxide from the surroundings (as the sole source of carbon) and (by using light energy) splitting water (as the source of electrons) to liberate oxygen as a by-product into the surroundings, it is called oxygenic photosynthesis.
    The overall process of oxygenic photosynthesis can be summarized by the following chemical equation of initial reactants and final products:
    CO2 (carbon dioxide) + H2O (water) + light -->
    (CH2O)n (some sugar or carbohydrate) + O2 (oxygen).
    Some authorities may attempt to define plants broadly to include organisms that directly produce food by oxygenic photosynthesis (Bell and Hemsley, 2000). Of all the organisms that fit this category, there is only one specific group of "prokaryotes" (organisms without a well defined nucleus) and the rest are specific groups eukaryotes (organisms with a well defined nucleus). The single group of oxygenic photosynthetic prokaryotes includes those bacteria called cyanobacteria. There are also certain photoautotrophs that can carry out a type of non-oxygenic or anoxygenic photosynthesis that does not generate oxygen as a by-product. These are also bacteria, but they are not considered plants, because even though they are generally considered photoautotrophs (produce food with the aid of sunlight), they do not generate oxygen. This may be considered a somewhat arbitrary way of deciding what is a plant versus what is not a plant. However, many books dealing with the plant kingdom (as broadly defined to include cyanobacteria) do not include the "non-oxygenic photosynthetic bacteria." The oxygenic-photosynthetic cyanobacteria are the only "prokaryotes" that have traditionally been considered "algae" (the so-called blue green algae). Although the ancestry of some of the non-oxygenic photosynthetic bacteria may predate oxygenic photosynthesis by a billion years, the ancestors of present day cyanobacteria were the first dominant organisms to carry on oxygenic photosynthesis, involving a combination of membrane bound photosystems called photosystem I and II. The cyanobacteria probably evolved from ancestor bacteria that once carried out non-oxygenic photosynthesis by a single photosystem and by utilizing some inorganic compound other than water as a source of electrons and protons. Through the help of some external source of energy (sunlight), part of the inner membrane bordering the cell called the plasma membrane, which in cyanobacteria is located underneath both a cell wall and an outer membrane, can become folded inwardly to develop into a membrane system inside the cell; and the two photosystems, including sunlight-harvesting units, can become embedded in such an internal membrane system. It is photosystem II that splits water and uses its extracted electrons and protons for reducing power and ATP to drive oxygenic photosynthesis. The new byproduct of photosystem II is oxygen, produced for the first time in abundance by the photosynthesis of cyanobacteria. These organisms were the first to carry out photosynthesis involving both photosystems I and II, and capable, therefore, of using light energy to extract electrons and protons from water, with the production of oxygen. Some of the electrons [and associated hydrogen ions (protons)] from the splitting of water molecules (liberating O2 molecules as a waste products) are used to build the organic structures of food molecules from the reduction of the simpler inorganic carbon dioxide (CO2) molecules [via addition of electrons (or associated hydrogen)] to produce the more complex and more energy rich food molecules (CH2O)n.
    Beginning at the start of the Proterozoic Era (about 2.5 billion years ago), these organisms (by 2.2 billion years ago) changed the composition of the atmosphere (oxygen build-up) as well as the color of earth's sediments (due to oxidation of iron and other metals, leading to the banded iron formations or "red beds" comprised of iron and other metal oxides). Although many bacteria were killed by the rising levels of oxygen in the atmosphere, organisms began to incorporate biochemical methods for rendering oxygen less harmful, leading to the evolution of aerobic or oxidative respiration (ability to employ oxygen in the process of cellular respiration = utilization via oxidative biochemistry of the energy stored in food for various other life processes). The cyanobacteria (soon after the origin of oxygenic photosynthesis) were probably the first to develop aerobic or oxidative respiration, which probably spread (via lateral gene transfer) from them to other bacteria. See geological history of oxygen.
    Of course, the eukaryotes that indirectly take advantage of oxygenic photosynthesis by a partnership with other (unrelated) food producing organisms cannot be considered plants even by this broad definition. For example, the photosynthetic flatworm Symsagittifera roscoffensis (= Convoluta roscoffensis), as well as such organisms as photosynthetic corals, are not considered plants, because tiny single celled (oxygen generating) photoautotrophs only live in partnership within some of the cells of the host organisms in an unmerged relationship called symbiosis, which should be distinguished from genuine symbiogenesis (Mereschkovsky, 1905, 1910) that involves the eventual merging of at least two different symbiotic organisms into a single species. Lichens, although dual (plant plus fungus) organisms, are considered fungi and not plants, because their fungus part apparently has the upper hand, while dual (plant plus fungus) organisms like mycorrhizae are considered plants and not fungi, because the plant part is most conspicuous. Of course, photosynthetic flatworms and corals or lichens and mycorrhizae are symbiotic collections of at least two different organisms and not single organisms or species. However, if a cyanobacterium is first incorporated within a single cell of some non-photosynthetic eukaryote in the process of symbiosis as outlined above, the two formerly distinct organisms can eventually become merged into one organism in the very rare process of symbiogenesis. In the first eukaryotic plant, the cyanobacterium became integrated via symbiogenesis as a perminant organelle called the chloroplast with the ability (never found in internal symbionts) to import over a thousand different proteins from the rest of the cell. Although thousands of genes were transferred from symbiont to the host nucleus, it is the specific import of proteins from the rest of the host cell and not the transfer of genes that actually integrates a symbiont as an organelle (Cavalier-Smith, 2007). An earlier symbiogenesis involving a photosynthetic alpha-proteobacterium also took place in the origin of another organelle in the eukaryote cell called the mitochondrion, which plays an imporant role in aerobic (oxygen dependent) cellular respiration. Therefore, the eukaryote cell can be considered a chimaera, a single organism resulting from the integrative merging (through symbiogenesis) of the genes and gene products that originated from two or more originally distinct organisms. Such a chimaera (as a single organism or species) that can carry out oxygenic photosynthesis is obviously (by the broad definition) considered a plant.
    However, the broad definition of plants (as those that carry out oxygenic photosynthesis versus those that do not) does pose certain problems. As a contradiction of this definition, isolated examples of non-photosynthetic types of plant parasites that are closely related to oxygen generating photoautotrophs have always been considered plants. For example, Monotropa uniflora (= Indian Pipe) in the blueberry family or some other non-photosynthetic types of plant parasites have always been considered plants that secondarily lost the need to carry on photosynthesis, because they are nested within groups of close relatives that do possess oxygenic photosynthesis. On the other hand, isolated examples, such as chlorarachniophytes and certain euglenoids that secondarily acquired oxygenic photosynthesis from other photosynthetic eukaryotes (see below), can be considered plants by the broad definition, even though they are nested within groups of close relatives that do not possess photosynthesis. The "chromophytes" [including chlorophyll c containing cryptophytes, haptophytes, heterokonts (= stramenopiles), and dinoflagellates] that by this broad definition are all considered plants (because they also secondarily acquired oxygenic photosynthesis) have apparently gaven rise (via multiple losses of photosynthesis) to numerous groups of non-photosynthetic organisms that are never considered plants. Therefore, although plants defined as organisms that directly carry out oxygenic photosynthesis form a functionally analogous group of organisms from the perspective of ecology (the study of the relationships between organisms and their environment), they are polyphyletic, comprising several distinct lineages that are not directly related to each other by descent from the same common ancestor.

  • Cavalier-Smith, Thomas (2007) Evolution and relationships of algae: major branches of the tree of life, In Juliet Brodie and Jane Lewis editors (2007) Unravelling the algae: the past, present, and future of algal systematics (Systematics Association Special Volumes), CRC Press, Taylor & Francis Group.
  • Mereschkovsky, C. (1905) Uber Natur und Ursprung der Chromatophoren im Pflanzenreiche. Biologisches Zentralblatt, 25: 593-604.
    Cited by Cavalier-Smith (2007).
  • Mereschkovsky, C. (1910) Theorie der Zwei Plasmaarte als Grundlage der Symbiogenesis, einer neue Lehre von der Entstehung der Organismen. Biologisches Zentralblatt, 30: 278-303, 321-347, 353-367.
    Cited by Cavalier-Smith (2007).

    In the broader definition of the plant kingdom, all simple water inhabiting or moist land dwelling organisms called "algae" (not a true lineage but rather a grade), whether "prokaryotes" or eukaryotes, together with more complex, dry land dwelling, oxygen generating photoautotrophs or their water inhabiting relatives are considered "plants." Traditionally, the so-called "thallophytes" [usually only spore producing organisms with a simple body type (thallus) not differentiated into shoot, root, or leaf parts, possessing a rigid wall around their cells] plus the more complex, dry land dwelling, spore or seed producing photoautotrophs (also with cell walls) were all considered "plants." The so-called "algae" (with absence of a well protected embryo, therefore, excluding all embryophytes) are the simpler, mostly water inhabiting or moist land dwelling "thallophytes" that are also oxygenic photoautotrophs. Another important character used traditionally to decide whether an organism should be considered a "plant" is lack of mobility or inability of the entire organism to move from place to place. This was another reason why the "thallophytes" originally often included the "bacteria," broadly defined "fungi," and all the "algae" (although some eubacteria and archaebacteria can possess motility via whip-tails that are not related to each other or to the flagella of eukaryotic "flagellates"). Many of these photoautotrophic or heterotrophic "thallophytes" with a relatively simple (undifferentiated) thallus, especially those with rigid cell walls and a relatively stationary life, depending on spores for reproduction, were considered plants. See mention of the old name "Thallophyta" above. However, today the broader definition of the plant kingdom is often restricted to lineages of oxygen generating photoautotrophs or certain isolated heterotrophic members of these lineages.

  • Jeffrey, C. (1971) Thallophytes and kingdoms - a critique, Kew Bulletin 25, 291-9.

    Other authorities may want to limit plants to only those food producing creatures (photoautotrophs) considered eukaryotes (organisms with a well defined nucleus) that directly carry out oxygenic photosynthesis. This does not include "prokaryotes" (organisms without a well defined nucleus), such as the oxygen generating, food producing "bacteria" (i.e., cyanobacteria or blue-green algae). This also does not include organisms, such as corals, sponges, squids, or giant claims, that indirectly take advantage of oxygenic photosynthesis by a partnership with food producing dinoflagellates (more specifically referred to as zooxanthellae), which can actually live in comfort within the cells of their animal hosts; nor does it include certain protochordate invertebrate animals called didemnids and other colonial ascidians of tropical sea shores that harbor between their cells the cyanobacteria of the genus Prochloron. It also does not include organisms like the sea slug Elysia chlorotica that carry out photosynthesis within their cells by transient bodies called kleptoplastids bound by two membranes, because these transient bodies (temporarily kept alive but eventually digested) actually originate from an ingested photosynthetic stramenopile type algae identified as Vaucheria litorea. Some dinoflagellates also possess membrane bound kleptoplastids. Such a partnership is called endosymbiosis (a more or less mutually beneficial relationship between two organisms in which one, the endosymbiont, lives within the host cells). Although eukaryotes that can be referred to as plants, including many dinoflagellates, glaucophytes, diatoms, brown, yellow-green, and red algae, cryptophytes, haplophytes, and green plants, including "green algae" (a grade) together with the most common land plants, originally all come from non-food producing ancestors that started out by maintaining an endosymbiosis with other food producing bacteria or eukaryotes, the descendants of these host ancestors have permanently incorporated oxygenic photosynthesis into their lives by the conversion within their cells of the food producers (endosymbionts) into integral components called chloroplasts [light gathering chlorophyll (or other pigment) containing units or organelles] that are passed on from one generation to the next. The process of evolution by which this took place is further clarified below. Chloroplasts can be modified to serve various other functions, such as specialized storage units for fats or sugars. Therefore, chloroplasts and all their modified forms are collectively referred to as plastids.

    Because the plant kingdom as defined above includes many organisms that are not directly related to each other and some of these organisms have many heterotrophic (non-food producing) relatives, other authorities may want to define plants as all the descendants of the very first eukaryote to acquire oxygenic photosynthesis as an integral part of its cells by initially engulfing (via a process called phagocytosis) a cyanobacterium (a type of oxygen generating, food producing bacteria). Although the engulfed cyanobacterium initially only functioned as a partner within the host cells in the process called endosymbiosis, this food producing organism became established within each host cell and eventually became a permanent fixture, the first chloroplast [a permanent sunlight aided, food producing organelle = a functional component within the host cell(s)], that could be replicated during cell division and passed on to subsequent generations. Some evidence (although not conclusive) indicates that this event occurred only once in the history of life and, therefore, involves organisms that are (apparently) all directly related to the very first eukaryote ancestor to acquire oxygenic photosynthesis. If the plant kingdom is exclusively defined as the group of all descendants from the purported first eukaryote with photosynthesis, the other unrelated organisms that acquired photosynthesis did so secondarily by initially engulfing one or another descendant of this group. Primary endosymbiosis involved engulfment of a cyanobacterium by the ancestor of all plants [i.e., glaucophyes, rhodophytes (= red algae), and viridophytes (= green plants)], while secondary endosymbiosis involved engulfment of algae (that already had chloroplasts) by the various different ancestors of all the "plant-like" organisms. Therefore, all organisms with some "plant-like members" (e.g., dinoflagellates, diatoms, brown, and yellow-green algae, as well as chlorarachniophytes and certain euglenoids) that secondarily acquired photosynthesis can be considered outside the plant kingdom.
    In the case above, the plant kingdom has been defined to include a proposed lineage called Archaeplastida Adl et al., 2005 (= Primoplantae J. D. Palmer, 2004), only including the Glaucophyta Skuja, 1954, commonly called glaucophytes, Rhodophyta Wettstein, 1901, 1922, commonly called red algae, and Chloroplastida Adl et al., 2005 (= Viridiplantae Cavalier-Smith, 1981), commonly called green plants or viridophytes. Note that dates are included together with authors in these optionally highlighted scientific names. These correspond to the publication dates of the names by the authors. The dates [like the author(s) names] are only optionally included but are sometimes useful in providing additional documentation in order to distinguish the same name that may have been applied to a different group of organisms by some other author(s) at some particular time(s).

    Most but not all of the new DNA evidence, especially from multiple genes, supports a likely sister group relationship between Archaeplatida (including glaucophytes, rhodophytes, and viridophytes) and an expanded kingdom Chromista, rendering the traditional "chromists" [including only cryptophytes, haptophytes, and stramenopiles (comprising, among other groups, the diatoms and brown and golden and yellow-green algae)] paraphyletic. Because of additional new evidence from multiple genes, the kingdom Chromista has recently been expanded by T. Cavalier-Smith (2010) to include not only the original groups of stramenopiles (= heterokonts), cryptophytes (plus katablepharids), and haptophytes, but also the alveolates, rhizarians and centrohelid heliozoans, making the super group name 'chromalveolates' now unnecessary. However, at least some recent DNA evidence (from nucleus encoded protein genes) indicate that the Archaeplastida, as defined above for the plant kingdom, is an invalid lineage. For example, nucleus-encoded eukaryotic translation elongation factor 2 (EEF2) gene sequence evidence (Kim & Graham, 2008) has uncovered a well supported lineage (excluding stramenopiles and glaucophytes) that includes the certain "chromists" called cryptophytes (plus katablepharids) and haptophytes, as well as rhodophytes and Viridiplantae. This new DNA evidence renders both the Archaeplastida and the traditional "chromists" as questionable lineages. [This is another reason for restricting the plant kingdom to a smaller and more well supported lineage (like that of viridophytes or embryophytes).] In most of these recent studies, there has been a consenus that stramenopiles group closest to the alveolates (including the dinoflagellates, malaria parasites, ciliates, and others); and stramenopiles + alveolates appear closest to the rhizarians (including many non-photosynthetic groups but also the chlorarachniophytes = green, amoeba-like algae with thin pseudopodia or cells bearing a single flagellum). All these plants or "plant-like organisms" are ancestrally biflagellates ("bikonts" with two flagella), although some members may secondarily bear only one flagellum or more than two flagella.

    The "chromistan algae" or "chromophytes" [although nested within the (newly supported) expanded kingdom Chromista] do not form a uniform group of directly related photoautotrophs. Within this expanded kingdom, subgroups of algal organisms (the photoautotrophs) are scattered in their relationships among various subgroups of heterotrophs. The "chromistan algae" can now be said to include the not all directly related divisions Cryptophyta, Haptophyta, Chrysophyta, Xanthophyta, Bacillariophyta, Phaeophyta, Dinophyta, and Chlorarachniophyta.

    On the basis of new DNA evidence involving multiple genes, the neozoan tree of life appears to stem from an ancestral grade of unicellular (single-celled) types of bikonts called core excavates with a rigid cell cortex (rigid peripheral part of cell just beneath the plasma membrane). The euglenozoans (euglenoids) also with a rigid cell cortex appear on one side of the eukaryote tree and core excavates plus neozoans on the other side. It is speculated that the eukaryote root may lie between the euglenozoans and core excavates plus neozoans or somewhere within the euglenozoans. Although euglenozoans may represent descendants from some of the earliest eukaryotes (if this depiction of the eukaryotic tree is the correct one), the ancestor of the phototrophic euglenozoans would have had to acquire its chloroplast via secondary endosymbiosis only after the emergance of the neozoan viridophytes (= green plants).

    The characteritics of the proposed last common ancestor of all eukaryotes (with the exception of the chloroplast) share much in common with the presently living euglenoids. If this is the correct interpretation of the DNA evidence, the so-called animal and plant sides should apply only to the upper, neozoan part of the eukaryotic tree of life. The animal side may include Amoebozoa Luhe, 1913, emend. Cavalier-Smith, 1998, possibly Apusomonadidae Karpov and Mylnikov, 1989 (= Apusozoa), and Opisthokonta Cavalier-Smith, 1987, emend. Cavalier-Smith and Chao, 1995, emend. Adl et al., 2005. The plant side may include Archaeplatida Adl et al., 2005 sister to the kingdom Chromista Cavalier-Smith 1981 emend. The kingdom Chromista, as recently defined by Cavalier-Smith (2010), includes two major lineages: Hacrobia (= cryptophytes + katablepharids, centrohelid heliozoans, and haptophytes) and Harosa (= SAR group for stramenopiles + alveolates and rhizarians). Both these major lineages of Chromista consist of some plant-like organisms together with many (non-food producing) heterotrophs with a large number of green and/or red algae genes that may have come from endosymbiosis of these algae by the common ancestor of Chromista. A startlingly new discovery has recently been made (Moustafa et al., 2009) that all the major plant-like groups of Chromista (i.e., cryptophytes, haptophytes, stramenopiles, and alveolates) already long accepted to have acquired their chloroplasts via secondary endosymbiosis from a red alga also have over a thousand genes (in some cases) in their nuclei that apparently come from a non-streptophyte green alga (one that is not a streptophyte, probably a primitive, "protistan" viridophyte called a "prasinophyte"). No visible evidence of an ancestral green algal endosymbiosis survives today in the cells of most of these plant-like groups that is comparable to the chlorophyll containing plastids likely from an endosymbiosis of a red alga. However, among the rhizarians, there is a green algae derived chloroplast found in the cells of chlorarachniophytes. Of course, this interpretation of the eukaryote tree of life requires further testing with additional studies and at this point can still only be considered an educated guess based on all the evidence that is currently available.

  • Cavalier-Smith, Thomas (2010) Kingdoms Protozoa and Chromista and the eozoan root of the eukaryotic tree, Biol. Lett. 6, 342-345
  • Eunsoo Kim & Linda E. Graham (2008) EEF2 Analysis Challenges the Monophyly of Archaeplastida and Chromalveolata, PLoS ONE 3(7): e2621.
  • Moustafa, A., Beszteri, B., Maier, U. G., Bowler, C., Valentin, K. & Bhattacharya, D. (2009) Genomic footprints of a cryptic plastid endosymbiosis in diatoms, Science 324, 1724-1726.

    Other authorities may want to limit what are called plants to only those of the lineage Chloroplastida Adl et al., 2005 (= Viridiplantae Cavalier-Smith, 1981) that are bright grass-green (the viridophytes or green plants), including Chlorophyta Pascher, 1914, emend. Lewis and Mc Court, 2004, referred to as the chlorophytes (green algae) sensu stricto, Streptophyta Bremer, 1985 (= Charophyta sensu Karol et al., 2001), often referred to as the streptophytes sensu lato, including Mesostigmatophyta (called mesostigmatophytes), Chlorokybophyta Kenrick & Crane, 1997 (called chlorokybophytes, e.g., Chlorokybus), Klebsormidiophyta Kenrick & Crane, 1997 (called klebsormidiophytes, e.g., Klebsormidium), Charophyta Kenrick & Crane, 1997 (called charophytes sensu stricto), Coleochaetophyta Kenrick & Crane, 1997 (called coleochaetophytes), Zygnemophyta Kenrick & Crane, 1997 (called conjugates), and Embryophyta Endlicher, 1836, emend. Lewis and McCourt, 2004 (the green land plants called embryophytes). Note that certain Latin words besides authors and dates can be sometimes incorporated into the scientific names. The abbreviation emend. (for the Latin word emendatio) means a correction or amendment. These additional words might also include Latin phrases, such as sensu lato (abbreviated s.l.) or sensu stricto (abbreviated s.str. or s.s.), distinguishing a broader or more inclusive and a narrower or more exclusive grouping, respectively. The Latin word sensu might mean 'in the sense of,' while sensu lato means 'in the broad sense' and sensu stricto means 'in the strict sense.' As in the author(s) and dates of publication of a scientific name, these additional Latin words or phases are optionally included in the name. This convention can often be used for more common names of various groups. For example, the grades called "green algae sensu lato" (including the lineage of green algae sensu stricto + "streptophyte green algae") and "streptophyte green algae" alone are considered artificial groups, because they both do not include all descendants (i.e., green land plants called embryophytes) from a common ancestor. The quotation marks indicate that a group is by itself artificial (not a true lineage) and often applies to a grade. Although Bremer et al. (1987) assigned the division name Streptophyta to "streptophyte green algae" plus green land plants, Jeffrey (1982) had already used this name (therefore, given priority by ICBN) to include only stoneworts (order Charales Lindley, 1836) plus embryophytes (land plants), both together once often referred to as the subdivision Streptophytina Lewis & McCourt, 2004. This has generated some potential confusion regarding certain names. The division Charophyta Kenrick & Crane, 1997 (= Charophyta Karol et al., 2001, emend. Lewis and McCourt, 2004) is now often referred to as charophytes sensu stricto or stoneworts (order Charales). However, this division is not the same as the much broader division Charophyta sensu Karol et al., 2001, which includes all "streptophyte green algae" (not just stoneworts) plus embryophytes. Furthermore, the charophytes s.s. are no longer commonly considered the sister group of embryophytes. As the DNA of more and more genes are being sequenced, analyses are now commonly providing evidence that the conjugates and not the charophytes s.s. are sister to embryophytes (land plants).

  • Bremer, K., et al. (1987) On cladistic relationships in green plants. Taxon 36: 339-349.
  • Jeffrey, C. (1982) Kingdoms, codes and classification. Kew Bulletin 37: 403-416.

    Streptophytes (formally named Streptophyta Bremer, 1985) can be defined (as done above) to include "streptophyte green algae" (a grade) plus land plants. Some of the "streptophyte green algae" (also called "charophycean algae") do not possess a phragmoplast [a structure within cells that consists of minute tubules (microtubules) and vesicles involved in cell division, often treated as a shared derived character that is also found in almost all land plants]. See phragmoplast marker and its discovery. Although the "streptophyte green algae" plus land plants may form a valid lineage (even though "streptophyte green algae" does not, because it excludes land plants), some have suggested that possible problems in applying names can be avoided by defining as streptophytes only those organisms (ancestrally) with all members possessing a phragmoplast, including charophytes sensu stricto plus land plants. This was the proported lineage of streptophytes sensu stricto or the subdivision Streptophytina Lewis & McCourt, 2004. Even though some members of Coleochaetophyta Kenrick & Crane, 1997 (often called coleochaetophytes) are known to possess a phragmoplast, all members do not; and Zygnemophyta Kenrick & Crane, 1997 (often called conjugates) only show signs in certain members of possessing such a structure. The debate on the closest sister group to land plants is still not settled, although there is considerable DNA evidence involving multiple genes that this sister lineage might possibly be the conjugates with only some members (e.g., the genus Spirogyra Link in C. G. Nees, 1820 of the order Zygnematales C.E.Bessey, 1907 and family Zygnemataceae Kutzing, 1843) only possessing a phragmoplast-like structure. The reader should be aware that streptophytes sensu lato applies to a broader or more inclusive group (usually all the "streptophyte green algae" plus all the land plants), while streptophytes sensu stricto applies to a narrower or more exclusive group (usually only the order Charales plus all the land plants that was at one time but no longer considered by many authorities as a true lineage). Some authors do not always specify whether their streptophyte group is sensu lato or sensu stricto. Furthermore, some authors may use the name "charophytes" to refer to only Coleochaetophyta and Charophyta Kenrick & Crane, 1997 (distinguishing them from Zygnemophyta and other "streptophyte green algae"), while others may mean all the "streptophyte green algae" (not including land plants). The reader should also be aware that Charophyta Kenrick & Crane, 1997 = Charophyta Karol et al., 2001, emend. Lewis and McCourt, 2004 (comprising only the order Charales) is not the same as Charophyta sensu Karol et al., 2001. In the classification of Karol, et al. (2001), "The Charophyta comprise the land plants and at least five lineages (orders) of fresh water green algae, and are sister to the Chlorophyta, which consist of essentially all other green algae." This applies (as outlined above) to Charophyta sensu Karol et al., 2001 (= streptophytes sensu lato) that are sister to Chlorophyta Pascher, 1914, emend. Lewis and Mc Court, 2004 (= green algae or chlorophytes sensu stricto). Fortunately, not all scientific names become associated with such complications (although some others can be worse). As genealogical relationships become better understood (with more agreement between authorities), these names can with time become simplified. For a more interesting topic, see comparative biology involving "streptophyte green algae" and land plants.

  • Karol, KG., McCourt, RM., Cimino, MT., CF. Delwiche (2001) The Closest Living Relatives of Land Plants, Science Vol. 294, 2351-2353

    Still other authorities may want to limit the plant kingdom only to green land plants [= embryophytes (those organisms with green chloroplasts and oxygenic photosynthesis that arose when a green water inhabiting ancestor invaded the drier land, and developed unique, well protected, many celled (multicellular) embryos)]. Certainly, the majority of the organisms that are considered to be plants by most people fall into this last group, today including what are commonly called liverworts, mosses, and hornworts, as well as the major hierarchical levels called vascular, seed, and flowering plants. See summarized characterization of embryophytes, starting with a description of the nature of spores, multicellularity, sporophyte and gametophyte, major land plants characters, comparative biology, types of spores, ancestry, zygotic versus sporic types of sexual life cycles, and ending with seed plants. See also sexual life cycle of flowering seed plants and sexual life cycle summary. During the discussion of the transfer of the single gene for flower color in pea plants, there is an example of the embryo sacs within the ovule before its fertilization by the sperm of the pollen or before the ovule becomes the seed. This one example provides a summary in terms of the transfer of a single gene of the sexual life cycle that can generally be expected in most flowering seed plants (within the broad lineage called Mesangiospermae Donoghue, Doyle & Cantino).

    Today, what is referred to as the plant sciences is often restricted to the study of either viridophytes (often less precisely referred to as green plants that include both "green algae" and embryophytes) or just embryophytes (often less precisely referred to as land plants that are descendants of "streptophyte or charophycean green algae"). Therefore, in the discussion of the colonization of land (terrestrialization) by organisms of marine (ocean) or aquatic (marine salt water or fresh water) origin that possibly began more than a billion years ago, the land adapted "algae" are often distinguished from what is referred to as the first plants. These first plants are assumed to have included "bryophytes" related to some present-day liverworts. Although the reader should be aware that there are several organisms of the green plant or viridophyte lineage other than embryophytes that can be considered terrestial (land dwelling) photoautotrophs, this restrictive point of veiw is currently embraced by many botanists, because the definition of the boundry or limits of what should be considered the plant kingdom is still being debated. However, it seems to this author that because of such strong evidence that embryophytes are nested within streptophytes and streptophytes within viridophytes, the green plants restricted to viridophytes should be considered (without much debate) monophyletic (as holophyletic) and consequently part of plant sciences. This is contrasted with traditional botany as the study of "bacteria" (prokaryotes, including, among others, photosynthetic cyanobacteria), almost all photosynthetic eukaryotes (various groups of "algae" and land plants), or any other, usually non-motile (relatively stationary), heterotrophic eukaryotes with spores and cell walls (e.g., broadly defined "fungi" that include true fungi plus "fungi-like" organisms, such as slime molds). Botany is still taught today in some schools, universities, and colleges from this traditional broad scope, including many other organisms besides those that are considered by most people to be plants. The rules for naming such a broad scope of organisms (including at least fungi and cyanobacteria together with probably any oxygenic photosynthetic eukaryote) is still under the influence of the International Code of Botanical Nomenclature or ICBN. However, although the naming of cyanobacteria is still under ICBN, there is now (since 1980) a separate Code (ICNB) for cyanobacteria and other bacteria. See also different definitions of what could constitute the plant kingdom.

    Although the naming of fungi is still under the Botanical (ICBN) Code, there are a few slight differences in some of the suffixes of the rank names. For ranked groups of fungi, the suffixes are -aceae for family, -ales for order, -mycetidae for subclass, -mycetes for class, -mycotina for subphylum, and -mycota for phylum (except for the phylum of parasites called Microsporidia Balbiani C. R.). Compare this with the normal scheme for naming plants. The phylum name Chytridiomycota M. J. Powell is retained in the recent classification system of Hibbett, et al. (2007), but the name is restricted to the class Chytridiomycetes Caval.-Sm. (including orders Chytridiales Cohn, Rhizophydiales Letcher, and Spizellomycetales D. J. S. Barr) and the class Monoblepharidomycetes J. H. Schaffn. (including single order Monoblepharidales J. Schröt.). In this classification, certain traditional "chytrids" are separated from Chytridiomycota and placed in their own phyla: Neocallimastigomycota M. J. Powell, and Blastocladiomycota T. Y. James. Hibbett, et al. (2007) does not consider the phylum "Zygomycota" a valid toxonomic group, treating as separate the phylum Glomeromycota C. Walker & A. Schüßler and several subphyla, including Mucoromycotina Benny, Entomophthoromycotina Humber, Kickxellomycotina Benny, and Zoopagomycotina Benny. The last mentioned subphyla remain unplaced in any phylum. The genera Caulochytrium, Olpidium, and Rozella, once placed in the traditional "Chytridiomycota", and the genus Basidiobolus, once placed in the now abandoned order Entomophthorales of "Zygomycota", remain unplaced in any higher ranking group. The fungal subkingdom called Dikarya Hibbett, T.Y. James & Vilgalys (= Neomycota Cavl.-Sm.) includes the two phyla Ascomycota Bold ex Caval.-Sm. and Basidiomycota Bold ex R. T. Moore; and, of course, the kingdom is Fungi. The current full name of the fungal kingdom is Fungi T.L. Jahn & F.F. Jahn ex R.T. Moore. The word "ex" means "validly published by." Fungi, as the name of one of six kingdoms of life, was introduced by Jahn & Jahn in 1949. The name was also used in a five kingdom system of classification advanced by Whittaker in 1959 and 1969. However, neither of these authors included a Latin diagnosis. Therefore, the name was invalid under the ICBN Code until the required Latin was provided by Moore in 1980. Even though there are other subgroups of fungi, the subkingdom Dikarya is probably the most important group from the medicinal point of view, including most (if not all) of the known medicinal lichens, molds, and mushrooms (with certain fungi outside this group only sometimes employed to produce the medicinal chemicals called steroids). The Latin diagnosis for the subkingdom name Dikarya was provided by Hibbett, et al. (2007). The use of this name is consistent with that of James, et al., Vilgalys (2006). Bold in 1957 appears to be the first to propose the phylum name Ascomycota. However, Bold did not include a Latin diagnosis, and a very short, two worded Latin diagnosis ("sporae intracellulares") was later provided for the name by T. Cavalier-Smith in 1998. Again, Bold is acknowledged for proposing in 1957 the name Basidiomycota, which in turn was validated with a Latin diagnosis by Moore in 1980. This gives the reader a few examples of how the history of names can be traced by way of their optionally included authors. This is the reason why dates of publication are also optionally included with the author names. See examples involving dates for certain names in the plant kingdom.

  • Bold H.C. (1957) The Morphology of Plants, Harper Row, New York.
  • Cavalier-Smith T. (1998) A revised six-kingdom system of Life, Biological Reviews 73: 203-266.
  • Hibbett, D.S., et al. (2007) A higher level phylogenetic classification of the Fungi, Mycol. Res. 111 (5): 509-547.
  • Jahn T.L. & Jahn F.F. (1949) How to Know the Protozoa, W.C. Brown, Dubuque.
  • James TY, et al., Vilgalys R. (2006) Reconstructing the early evolution of the fungi using a six gene phylogeny, Nature 443: 818-822.
  • Moore R.T. (1980) Taxonomic proposals for the classification of marine yeasts and other yeast-like fungi including the smuts, Botanica Marina 23: 361-373.
  • Whittaker R.H. (1959) On the broad classification of organisms, Quarterly Review of Biology 34: 210-226.
  • Whittaker R.H. (1969) New concepts of kingdoms and organisms, Science 163: 150-161.

    The kingdom Fungi can be defined as a combination of at least 6 characters. They are (1) always eukaryotes [possessing within their cells functional units called organelles that are often membrane bound (e.g., the double membrane bound nucleus, containing most of the genes and chromosomes)]; (2) each of their cells are surrounded by a wall usually made of variable amounts of a resistant material called chitin [made up of many nitrogen containing (modified) sugar (N-acetyl-glucosamine) units], other materials containing linked (unmodified) sugar units called alpha- and beta-glucans, and some proteins called glycoproteins, containing short side chains of linked (unmodified) sugar units; (3) they can form a multicellular body called a mycelium [a network of branching filaments (narrow, elongated chains of cells called hyphae)] or they can exist as single cells (e.g., yeasts); (4) they reproduce by (often) aerial spores (those disseminated by air currents) or (only in "chytrids") zoospores [motile (swimming) spores, each propelled by a single posterior flagellum]; and (5) they are heterotrophs (e.g., saprobes, parasites, or symbionts) that (6) all selectively feed by absorption [= osmotrophy - secreting exoenzymes on food and absorbing the simple nutrient substances dissolved in water that result from the externally digested food material]. Absorption can generally be said to involve the uptake of small nutrient substances by the body of an organism. In fungi, this is osmotrophy (selective absorption of simple, externally digested nutrients). In the osmotrophy of many filamentous fungi [most of which are primarily saprotrophs (= saprobes ~= decompsers)], a large amount of exoenzyme secretion occurs across the cell membranes via the process called exocytosis, while absorption of digested nutrient substances occurs across the cell membranes via the processes called pinocytosis and receptor-mediated types of endocytosis, and active transport. However, in many yeasts, osmotrophy occurs with little or no secretion of exoenzymes. See fungi and plants and osmotrophy.

    If organisms possess all six characteristics that are mentioned above (not just one or a few of these character but all of them, together), the chances are that these organisms are members of the kingdom Fungi is relatively high. However, if not all these characters can be applied (because they may not always be easily observed without a microscope or some other technical means of testing for their occurrence), the organisms examined (although possessing many of these characters) may end up being members of various unrelated groups with several fungus-like features. Such organisms (from the standpoint of ecology) may even have similar or almost identical functions as the true fungi in the environment; and many of these "fungus-like creatures" were once often (traditionally) grouped together with the true fungi. Organisms that carry on osmotrophy are said to be osmotrophic. Although all fungi are osmotrophic, most are saprotrophs, and none undergo phagocytosis or ingest food in any other way, the nutritional mode osmotrophy alone does not distinguish fungi from all other organisms. Even though most animals carry on phagocytosis or ingest food in some other way and lack cell walls, there are at least some that are osmotrophic. As a primitive character found in many unrelated organisms, osmotrophy is more widespread than phagocytosis (or phagotrophy = ingesting or engulfing food), which is restricted to only eukaryotes (organisms with a well defined nucleus). Phagocytosis or filter feeding (= suspension feeding, obtaining food from the particles suspended in the water) can be found in sponges, "protozoa" and "coelenterates." Unlike fungi, many animals ingest larger food particles, but like fungi, animals can carry on extracellular (outside cell) digestion by exporting or secreting digestive enzymes and, in turn, taking up the resulting soluble nutrients by osmotrophy. However, unlike fungi, extracellular digestion and osmotrophy in animals usually takes place within a digestive tract. Nevertheless, it appears that fungi and animals are more alike and closely related than was once thought: they both share the ability (through exocytosis) to export proteins called digestive enzymes that break down (or digest) food through hydrolysis (the breaking of chemical bonds, through the addition of water); they can both take up the simpler digested nutrients by osmotrophy; they both store their food energy as glycogen; they are both often composed of structures made of chitin; a protein called collagen has been found in some fungi and almost all animals (but not elsewhere); and they both have certain cells with a single flagellum that (when present) beats behind these cells. There are also many unrelated organisms, such as certain "prokaryotes" (= "bacteria" = organisms without a well defined nucleus) and some eukaryotes, including certain single-celled "protozoans" and several multiple-celled, "fungus-like organisms," that use osmotrophy as their principal mode of nutrition. In order to distinguish fungi from other functionally similar, "fungus-like eukaryotes," such as oomycetes (water molds and downy mildews), corallochytrids, hyphochytrids, thraustochytrids, cellular slime molds, plasmodial slime molds, other types of slime molds (such as the acrasids, copromyxids, and fonticulids), and the plasmodiophorids (= plasmodiophoromycetes) that are parasites of certain plants, there are several much more technical distinctions that should probably be added to the 6 characters listed above. This will not be attempted here, but will be covered in more detail by at least one additional paragraph on a page to be added to the dictionary. Many of the "fungus-like organisms" (e.g., corallochytrids, hyphochytrids, labyrinthulids, oomycetes, and thraustochytrids) acquired cell walls and evolved osmotrophy independently of the entire kingdom Fungi. Most slime molds and plasmodiophorids have often been considered "protozoans." These are amoeba-like organisms (unrelated to each other and to kingdom Fungi) that have independently acquired aerial spores similar (convergent) to those of Fungi. See examples of independent (convergent) evolution. At this point, the reader should at least appreciate that precise definitions of whole kingdoms of organisms, such as fungi, plants, or other types, are not always that easy. This is especially true, the more inclusive the kingdoms become. In the history of biology and solely on the basis of anatomy or morphology, it has almost always been difficult to define clearly any of the higher levels of taxonomic rank; and it has largely been found impossible to do so for many of the earliest fossil groups.

    Since traditionally the animals included almost all the "protozoa" and the "plants" included land plants, as well as collectively, the "thallophytes" (fungi, "fungus-like" organisms, "algae" and certain "bacteria"), the naming of these organisms has been subject exclusively to either the Zoological Code or the Botanical Code, an arrangement which was strongly influenced by the 17th century, two kingdom system of life originally popularized in the 18th century by Linnaeus. Although both the International Code of Botanical Nomenclature (ICBN) and the International Code of Zoological Nomenclature (ICZN) were originally based on similar objectives that there should be (ideally) a unique name for each rank (= taxonomic category = taxon), this name should be the same worldwide, independent of the any particular language, and the choice of competing names should be determined by precedence in date of publication, these two Codes diverged in the mid-19th century. Furthermore, in the 1950s the bacteriologists (those that study "bacteria") set up their own Code based on the Botanical Code that they had previously followed. This Bacteriological Code (BC) first became official in 1973 (with a new starting date), as an offshoot of the ICBN. As a consequence, the blue-green algae (= cyanobacteria) are now treated under both the Botanical (ICBN) and Bacteriological (ICNB) Codes.

    Today, classification systems are more often based (as much as possible) on a proposed nested hierarchy of lineages, which are groups within broader groups within even broader groups, etc. that are (at least ideally) neither polyphyletic (not all necessarily directly related by a single common ancestry) nor paraphyletic (not comprising all descendants), although (according to a few modern authorities) the existence of a certain number of paraphyletic groups in classification is sometimes (in practice) unavoidable. See more on this below for microbes. [Another example is the current acceptance of a paraphyletic subtribe "Carduinae" (Cass.) Dumort. of the tribe Cardueae Cassini (= Thistles) in the family Asteraceae (see Cardueae Tree).] Because of this recent trend to formally name only monophyletic groups (single common ancestor together with all its descendents), some older formal names can now be invalidated and newer ones published (along with a Latin diagnosis) provided that the older names represent invalid lineages and the newer ones represent valid lineages previously unnamed. A brief, nested hierarchy of lineages is given for each family listed in the dictionary. Links will evidentially be included to an additional web page with formal names for these lineages (if published) and a description of each lineage in terms of shared derived or other diagnostic characters. An example of a nested hierarchy of informal names of lineages including the flowering plant family Asteraceae is given below.

    The history of taxonomic biology (~= systematics) and the subdivision called taxonomic botany can be summarized as a history of formal and informal names. Although many of these names are now recognized as invalid (not true lineages), the reader that chooses to access the older literature on medicinal resources should at least be introduced to some of these older names in order to develop some insight on the nature of valid versus invalid names. Furthermore, some names presently considered invalid by most authors are still occasionally used in classification by some authors (e.g., "Algae" or "Bryophyta" or "Pteridophyta"). They are often also informally employed to characterized organisms of unrelated lineages with roughly the same grade or level of complexity. The capitalized group names mentioned in this web page in quotes that are in bold print, although once formally recognized and (some of them) still recognized as such by some biologists, are now largely considered polyphyletic or at least paraphyletic and often no longer formally recognized. Sometimes quotes are also placed around informal names (here, not capitalized, not in bold print, or not italicized) for the same reason of indicating that they represent names of groups currently not considered valid (i.e., not true lineages). Therefore, quote marks surrounding a formal or informal name for a group of organisms or surrounding a short phrase describing this group (as an alternative to a name) are used here to signify that this name or phrase does not apply to a true lineage, but it applies to an artificial group that has more recently been found to be either polyphyletic or paraphyletic. This summary starts with the older two or three kingdom classification system of life and culminates with the most recent three domain hypothesis for the entire the tree of life, including "prokaryotes" and eukaryotes. The more recent hypothesis for the eukaryote tree of life is also outlined (the reader is not expected to fully understand all the groups of this vast assemblage). From this historical prospective, there are several attempts to define "plants" at the level of kingdom.

    Only in relatively recent times (discussed more later on this page), the the better understood eukaryotes called "macroorganisms" (especially the multicellular ones, such as land plants and animals) began to be distinguished from the often less understood, "left-over" organisms now often referred to as the "microorganisms" ["fungi" (including true fungi + "fungus-like organisms") + the predominantly unicellular but sometimes multicellular "protists" ("algae" + "protozoa") and the rarely multicellular "prokaryotes"]. This ultimately misleading but often initially helpful trend in biological science to distinguish (and in turn segregate) better understood from less understood organisms may even apply (here and there) to the modern attempts to reconstruct the tree of life.

    Since all organisms were once upon a time classified as either "plants" or animals, the less understood "fungi" (true fungi and "fungus-like organisms"), as well as "bacteria" ("prokaryotes") and "algae" (all oxigenic photoautotrophs without well protected embryos), were classified in the plant kingdom, based mainly on the presence of a cell wall, immobility, and the lack of any ingestion of food material (no phagotrophy). These were the least understood "crytogams" of the plant kingdom, including the "plant-like organisms" later called the "thallophytes" (those without well defined organs called leaves, stems, and roots). They were grouped together with other not well understood "crytogams" called "bryophytes" ("moss-like land plants") and "pteridophytes" ("fern-like land plants") plus the better understood and more conspicuous phanerogams (seed plants).

    In the history of botany, those 'higher' forms (like seed plants, especially flowering plants) that comprise the most common, conspicuous, or useful elements of the plant kingdom (however defined) were studied first; and the less conspicuous and often simpler forms were frequently defined as all the "left over organisms" without the characteristics of the 'higher' ones (Bower, Drummond, Bond, & Wardlaw, 1947). At the time of Linnaeus, there were recognized the more conspicuous seed plants called phanerogams (from the Greek phaneros, meaning 'visible') versus the left over or less understood seedless plants called "cryptogams" (from the Greek kryptos, meaning 'hidden'). The word gamos (meaning 'marriage') was combined with phaneros or cryptos. During and prior to the time of Linnaeus, almost everyone believed that all plants possess flowers and fruits. Therefore, all the phanerogams (seed plants) were initially thought to exclusively comprise the more common and conspicuous flowering plants (today often called angiosperms). The means of sexual reproduction in the left over plants called "cryptogams" was not that apparent even much later to 19th-century botanists. These were plants or "plant-like organisms" that produced only dust-like spores and never seeds. The distinction between phanerogams and "cryptogams" began to be defined prior to Linnaeus as focus on reproductive features called fructification in plant classification became more emphasized. See Gesner, Cesalpino, John Ray, and Tournefort. Although it is now known that the evolutionary succession of many other events must be explained to get an understanding of trees or the flowers and fruits of the herbs, shrubs, and trees of angiosperms, these were some of the first more conspicuous plants or plant parts to be recognized and studied. However, in order to truly understand trees, and the flowers and fruits of the herbs, shrubs, and trees of angiosperms, the historic (evolutionary) perspective is necessary, concentrating on successive descent with modification that led to the simplest, initially least understood "steptophyte green algae" and land plants from earlier forms of life that were even less understood until recently. It is now known that this step by step evolution or descent with modification of plants started about 4 billion years ago with very simple life forms and has culminated in the relatively recent dominance of angiosperms on land from the Cretaceous to the present.

    By the 20th century, G. M. Smith's Cryptogamic Botany, McGraw-Hill, New York, treated "Algae" plus "Fungi" in Volume I (1938) and "byophytes" (mosses or "moss-like plants") plus "pteridophytes" (ferns or "fern-like plants") in Volume II (1955). The merging together of the less understood plants often resulted in "artificial groups" of left over organisms that are now considered polyphyletic (not all directly related by a single common ancestry) or paraphyletic (not comprising all descendants). For example, as this process continued, the entire group of better understood organisms called embryophytes (~= land plants) were contrasted with the less understood (left over) "plants" referred to as "Thallophyta." Since the fertilized egg (called the zygote) of most land plants, during the early stages of development, becomes a multicellular embryo and the embryo is either protected within a female sex organ or within the seed, the "Thallophyta" were defined as those "plants" with zygote not developing into a multicellular embryo within a protective female sex organ or seed.
    Unlike the majority of land plants, the polyphyletic "Thallophyta" do not possess true roots, stems or leaves and they are typically nonvascular (without a well-defined water-conducting system of cells called the xylem). There was also proposed a paraphyletic group of 'lower' forms called "Bryophyta" (liverworts, mosses, and hornworts) of "more or less thalloid embryophytes" (with protected multicellular embryos but without roots and no xylem). A paraphyletic group is ancestral to at least one other group. "Bryophyta" is ancestral to vascular plants, but "Bryophyta" is not a complete lineage and considered paraphyletic, because it does not include its vascular plant descendants. The "Bryophyta" (treated as an invalid taxon or taxonomic group by many modern botanists) was considered to be composed of organisms 'higher' than "Thallophyta" but 'lower' than Tracheophyta (= vascular plants). Although embryophyte land plants together are now known to be all directly related, most of the superficially similar, "more or less thalloid land plants" (those sometimes without leaves or shoot and never with a root) were once placed in the paraphyletic group called "Bryophyta," defined as those embryophytes that lack well-defined water conducting cells called tracheids (a diagnostic or defining character for vascular plants). All those superficially similar embryophyte land plants [including Lycopodiophyta (= lycophytes), as well as the ferns and horsetails] with tracheids but that lack seeds were placed in the paraphyletic group called "Pteridophyta." See also living members of the group called "pteropsids" (including only ferns plus cycads, the genus Ginkgo, conifers, gnetophytes, and angiosperms). Such classification systems for "plants" (including the above, now considered artificial groups with formal names here highlighted and in quotes) were once common throughout the first half of the 20th century (e.g., Bower, Drummond, Bond, & Wardlaw, 1947).

  • Bower, F.O., J.M.F. Drummond, G. Bond, & W.C. Wardlaw (1947) Botany of the living plant, fourth edition, London, Macmillan and Co., ltd.

    The "Thallophyta" (as part of the "plant kingdom" of the old two kingdom system of life) is now considered an artificial residuum of all so-called "plant-like organisms" (those traditionally treated as "plants") other than the embryophytes (most of the land plants). Such a residuum (now considered a "garbage heap" of only superficially similar elements) can be thought of as a left over group of less distinctive, often not directly related, and often less conspicuous or little understood organism defined solely on the basis of what they lack compared to a more distinctive, often more conspicuous, and better defined group. The residuum called "Thallophyta" was composed solely of the "plant-like thalloid organisms" (those simpler, not necessarily directly related ones without differentiated leaves, shoot, or root). Originally, this group excluded only the animals and the "animal-like protozoans." Therefore, it included not only the "algae" plus cyanobacteria (traditionally considered blue-green algae) but also the fungi, "fungus-like organisms" (traditionally treated as fungi), and often also the "bacteria." The system proposed by Eichler in 1886 was widely adopted and still has (in more or less modified form) influence on the classification systems in some present-day textbooks. In his system, most unicellular organisms ("protists" possibly not distinguished from "bacteria") are apparently excluded from the "thallophytes"; but all plant divisions other than that of the "thallophytes" is not recognized by him collectively as a higher level group (now called Embryophyta).

    Division I. "Thallophyta"
    Class 1. "Algae"
    Class 2. "Fungi"
    Division II. "Bryophyta"
    Division III. "Pteridophyta"
    Division I. Gymnospermae
    Division II. Angiospermae
    Class 1. Monocotyleae
    Class 2. "Dicotyleae"
  • Eichler, A. W. (1886) Syllabus der Vorlesungen liber specielle und mediciriischpharmaceutische Botanik, 4th ed. Berlin.

    As late as 1960, Arthur Conquest divided "plants" into two major groups: "Thallophyta" and Embryophyta. The second group called Embryophyta included Spermatophyta - seed plants [Anthophyta (flowering plants) and Gymnospermae - nonflowering seed plants (Cyadophyta - cycads and Coniferophyta - conifers)], "Pteridophyta" [Filicophyta (Filices - ferns), Calamophyta (Equisetae - horsetails), Lepidophyta (Lycopodiae - clubmosses or spikemosses), and Psilophyta (Psilotae - whisk ferns)], and "Bryophyta" [Anthocerotae (hornworts), Hepaticae (liverworts), and Musci (mosses)]. The first group called "Thallophyta" included "Fungi" (true fungi and "fungus-like organisms"), "Algae" (Phaeophyta, Chrysophyta, Pyrrophyta, Rhodophyta, Euglenophyta, "Chlorophyta," and Cyanophyceae), and "Schizophyta" (Cyanophyceae and "Bacteria"). The cyanobacteria of class Cyanophyceae were considered "algae" and at the same time considered (together with the non-algal "Bacteria") members of "Schizophyta" [a name proposed by Cohn (1875) for life forms distinct from all eukaryotes]. Recognizing it as somewhat speculative, Conquest represented this classification as what he called a phylogenetic tree, useful in helping to keep organized scientific knowledge about various kinds of "plants" to facilitate information retrieval. In a diagram of the tree proposed by Conquest (1960), it was indicated that within the "green algae" (division "Chlorophyta") the class Chlorophyceae (e.g., genus Chlamydomonas) descended with relatively little change from the ancient algal ancestors of the embryophytes, while within the same division, his class Charophyceae (now known to actually share ancestry with embryophytes) appeared as a dead ended branch. It should be obvious to the reader that Conquest's overall (1960) classification (with a few minor differences) resembles closely that of Eichler (1886) or even some earlier classifications. Like many earlier systems, Conquest did not separate Psilophyta + Calamophyta + Filicophyta from Lepidophyta but placed all these groups within "Pteridophyta" (ferns and fern allies). The main difference in Conquest's system versus many earlier systems was the major division of "plants" into embryophytes and "thallophytes" rather than phanerogams and "crytogams" (traditionally more broadly defined than the "crytogams" of modern ecology). The phanerogams (seed plants) of the older systems correspond to Conquest's division Spermatophyta. The land dwelling "bryophytes" and fungi (lichens included), as wells as certain land dwelling "algae" together with "bacteria" and all the aquatic "algae," were traditionally lumped together and considered "thallophytes" (including, as a group, the least understood remainder of the "cryptogams"). From Conquest's system, it can be seen that this practice continued well past the middle of the 20th century.

    Very few more modern authors may still include all the "algae" in a single subgroup of "plants," but in eliminating the major group called "Thallophyta," they may exclude fungi (traditionally considered plants), lichens (traditionally sometimes confused or grouped with "bryophytes"), and "fungus-like organisms" (traditionally treated as fungi), as well as most "bacteria" (but often those other than cyanobacteria, which were traditionally treated as "algae"). The less controversial placement within well supported lineages of many of the "terrestrial (land dwelling) algae" [those not considered embryophytes and once haphazardly grouped together with other so-called "thallophytes" (= "nonvascular cryptogams")] has only occurred (more or less) within the last few decades. See also single celled organisms and bacteria names.

  • Conquest, A (1960) The divisions and classes of plants, Bot. Rev., 26: 425-482.

    Even though lichens have been found to be dual organisms, comprising food producing cyanobacteria or green algae s.s. merged with certain fungi, the lichens are now placed within fungi in groups most closely related to their fungal components. Therefore, with the eventual separation of fungi from the plant kingdom, the lichens are no longer considered a type of "bryophyte" or "algae."

    If (1) "prokaryotes" (mostly unicellular) and (2) "protozoans" or "protists" (mostly unicellular), (3) animals (essentially all multicellular), (4) fungi (mostly multicellular, few unicellular), (5) plants (mostly multicellular and some unicellular), and (6) chromistans (mostly unicellular and some multicellular) are considered six separate kingdoms, the "fungi," if defined from the standpoint of function or ecology, could include heterotrophic "prokaryotes" (e.g., actinomycetes), "protozoans" (e.g., various slime molds), true fungi or eumycotans (e.g., chytrids, microsporidia, yeasts, molds, and mushrooms), and chromistans (e.g., pseudofungi, plasmodiophorids, etc.), while "algae" could include autotrophic "prokaryotes" (e.g., cyanobacteria), "protozoans" (e.g., euglenids), plants (e.g., glaucophytes, "green algae" including "streptophyte algae" s.l., and red algae), and chromistans (e.g., crytophytes, haplophytes, diatoms, chrysophytes, kelps, dinoflagellates, and chlorarachniophytes). In modern ecology, the name "crytogam" is also sometimes used, although more restrictively, for low lying organisms that make up the ground or surface layer of vegetation. For the sake of keeping things as simple as possible, formal and informal names of organisms based on ancestor-descendant relationships (lineages) are emphasized in this work, and names given organisms for other reasons may be included but they are not considered as important for the reader to learn. The formal names not corresponding to lineages are often highlighted and always singled out by placing them in quotes (e.g., the kingdoms "Bacteria" and "Protozoa" of some authors). If informal names not representing lineages have been used over and over again, such as bacteria, prokaryote, protozoan, protist, algae, bryophyte, fern ally, etc., they are not always placed in quotes. Such informal names are often used by many modern authors for organisms with a similar appearance, function, or level of complexity but not necessarily directly related to one another.

    According to a few modern authors, all organisms ancestrally with chlorophyll and oxygenic photosynthesis should be considered plants. Although the term has fallen out of favor in recent years, some of these authors still define "Algae" as all plants that lack the characteristics of embryophytes. Other authors exclude cyanobacteria and consider as plants only the eukaryotes that possess plastids. The "Algae" then can be defined as all plants with plastids that lack the characteristics of embryophytes. According to the genes of the plastids all members of this group share a common ancestry with cyanobacteria. They are a monophyletic group with respect to the genes in their plastids. In other words, DNA in the plastids is more closely related to the DNA of free-living cyanobacteria than to the DNA in the nuclei of the cells bearing the plastids. However, according to the genes of the nuclei, the group "Algae" comprises a mixture of unrelated, photosynthetic, usually aquatic eukaryotes. They are a polyphyletic group with respect to the genes in their nuclei. They have become a left-over group of "primitive plant-like organisms" that lack the more derived characteristics of the better understood embryophytes.

    Certain photoautotrophic organisms like the mostly unicellular dinoflagellates, although in the past sometimes considered members of "Protista" (or more commonly "Protozoa") but often treated as "algae," are still named according to the Botanical Code (ICBN). Some modern authors, as recent as 2000, still place them in the division of eukaryotes called Dinophyta of the subkingdom "Algae." In such a classification system, "Algae" is defined to include (1) the named divisions of photosynthetic "prokaryotes" called "Cyanophyta" (= cyanobacteria with chlorophyll a) and "Prochlorophyta" (= cyanobacteria with both chlorophylls a and b) plus (2) the named divisions of photosynthetic eukaryotes called Euglenophyta (euglenoids), Chlorarachniophyta (chlorarachniophytes, e.g., the genus Chlorarachnion), Dinophyta (dinoflagellates), Cryptophyta (cryptophytes or cryptomonads), Haptophyta (haptophytes or haptonema organisms), Chrysophyta (chrysophytes or golden algae), Xanthophyta (xanthophytes or yellow-green algae), Bacillariophyta (diatoms), Phaeophyta (phaeophytes or brown algae), Glaucophyta (glaucophytes or glaucocystophytes), Rhodophyta (rhodophytes or red algae), and "Chlorophyta" ("chlorophytes" or "green algae"). Therefore, the photosynthetic subkingdom "Algae" (a narrowed version of the old "Thallophyta") excludes all non-food producing heterotrophs, as well as the chemolithotrophs and anoxygenic photosynthetic bacteria, plus the photosynthetic subkingdom Embryophyta (embryophytes or most land plants).
    In such a system of classification, the photosynthetic subkingdom Embryophyta includes the divisions "Bryophyta" (liverworts, mosses, and hornworts) and Tracheophyta (tracheophytes or vascular plants).
    All organisms considered "plants" can still be subdivided as Embryophyta (all photoautotrophs with a well protected embryo) and "Algae" (all left over photoautotrophs, including cyanobacteria, without a well protected embryo).
    As recent as the year 2000, such a classification system included the following major groups, all considered part of the plant kingdom:

    The reader should at least be informed that occasionally some modern authors (e.g., Bell and Hemsley, 2000) still employ in their classification systems some of the old, now largely considered invalid group names that have been singled out here by placing them in quotes, although some of the groups bearing the names may or may not always include the same original combination of organisms. All the "plant-like organisms" (still subject to the Botanical Code for their names) possess the chlorophyll molecules, the sunlight absorbing, green pigments that aid them in producing food in a process called photosynthesis; and a by-product of this process of photosynthesis is always oxygen.
  • Bell, PR and AR Hemsley (2000) Green plants, Their origin and diversity, second edition, Cambridge University Press.
    [In this book, "green plants" are not restricted to what has been referred to here as viridophytes.]

    Although the relationships between the divisions of "algae" in the above classification system are not defined in any detail, all the above divisions [with the exception of "Cyanophyta" (= "blue green algae" with exclusion of "prochlorophytes"), "Prochlorophyta" (= "prochlorophytes"), and "Chlorophyta" (= "green algae")] represent valid lineages. Even though "Cyanophyta" plus "Prochlorophyta" probably form a true lineage, "Prochlorophyta" is an artificial group of not directly related organisms within this broader lineage. "Chlorophyta" is paraphyletic only because it excludes its descendant Embryophyta (= embryophytes or land plants). However, even though most of the divisions correspond to lineages, most of these divisions are not directly related to one another. From DNA evidence, the divisions Cryptophyta (= cryptomonads) and Haptophyta (= haptophytes or haptonema organisms) appear nested within a broader lineage recently called Hacrobia (hacrobians). [The super group Hacrobia (= HC) might include haptophytes and cryptomonads, as well as biliphytes, katablepharids, centrohelid heliozoa, and telonemids.] Divisions Chrysophyta (= golden or golden-brown algae), Xanthophyta (= yellow-green algae), Bacillariophyta (= diatoms), and Phaeophyta (= brown algae) appear nested within a broader lineage called stramenopiles (= heterokonts with two dissimilar flagella). Division Dinophyta (= dinoflagellates) appears nested within a broader lineage called the alveolates. Division Chlorarachniophyta (= chlorarachniophytes), including the genus Chlorarachnion, appears nested within a sublineage Cercozoa of the broader lineage called the rhizarians. [The super group Rhizaria might include core cercozoans, such as filose testate amoeba, cercomonads, and chlorarachniophytes, as well as foraminifers, plasmodiophorids, haplosporidians, gromiids, and (early diverging) radiolarians.] The stramenopiles and alveolates appear more closely related to each other than to the rhizarians. The lineage Harosa (= SAR), comprising stramenopiles, alveolates, and rhizarians, may be sister to Hacrobia (hacrobians). These two sister lineages together comprise the expanded lineage Chromista. The lineage Archaeplastida (= Plantae sensu lato), comprising divisions Glaucophyta or Glaucocystophyta (= glaucophytes or glaucocystophytes), Rhodophyta (= red algae), and "Chlorophyta" (= "green algae") + subkingdom Embryophyta, appears sister to the expanded lineage Chromista. The Plantae (glaucophye, rhodophyte, viridophyte) + HC (haptophyte, cryptophyte) + SAR (stramenopile, alveolate, rhizarian) mega group includes the majority of the photosynthetic eukaryotes. Other than the groups of "prokaryotes" representing cyanobacteria, the division Euglenophyta, as the most divergent eukaryotic "algae" (far removed from the plant + HC + SAR mega group), appears to group close to the base of the eukaryote tree of life. From comparison of the genes of nuclei, all the groups of eukaryotes are more closely related to each other than they are to the groups of "prokaryotes" called cyanobacteria. See eukaryotes versus "prokaryotes." As mentioned above, all organisms considered by some authors as "plants" (the groups of subkingdoms "Algae" and Embryophyta) possess chlorophyll and carry out oxygenic photosynthesis. This does not include the photoautotrophic types of "bacteria" that possess bacteriochlorophyll and carry out anoxygenic photosynthesis. See short history of photosynthesis and hypothetical tree for photosynthetic bacteria. For modern outline of the tree of life (as presently understood), see last common ancestor of all living eukaryotes (possessing phagocytosis resulting in endosymbiosis), the eukaryote tree of life [including the plant side (corticates and "Chromophyta") and animal side (Unikonta or unikonts)], and the (?) three domains of all life or a paraphyletic, eubacterial ancestry of all life.

    Much of the diversity of life is unknown to most people. Only the larger, multicellular organisms (made up of many cells), such as brown, green, and red seaweeds, fungi, land plants, and animals, are that noticeable. Even though evolution would generally (with notable exceptions) be expected to work from 'lower' (simpler) to 'higher' (more complex) forms of life, the more distinctive or often more conspicuous 'higher' forms are still usually best understood at first by those that study life; and the left over, often simpler forms are often understood later and often defined (at least initially) in terms of what they lack compared to the 'higher' forms. Since multicellular organisms are often more conspicuous, they were often the ones studied first. Consequently, the unicellular organisms initially became the left-over and least understood types. According to Gilbert M. Smith (1938), "the older distinctions between the plant and animal kingdoms (based upon motility, nutrition, and the presence of a cell wall) break down completely when applied to unicellular organisms, and it is quite impossible to establish criteria that will differentiate in a clear-cut manner between" the unicellular ancestor of plants ("protophyta") and unicellular ancestor of animals ("protozoa"). Nevertheless, the fundamental differences between multicellular plants, animals and fungi reflect their independent origins from different unicellular ancestors. Only recently have scientists been able to recognize a likely evolutionary link between certain living unicellular organisms and certain living multicellular organisms that can be considered plants, animals, or fungi. In some cases, the closest living unicellular organisms to the unicellular ancestor of certain multicellular organisms have been likely located. However, this has often required the relatively recent availability of the electron microscope or DNA sequencing. An interesting exception to this is the late 19th century recognition by Haeckel of the unicellular choanoflagellates as the closest living organisms to the unicellular ancestor of the animals. Although not yet certain, it is possible that the closest living relatives to the unicellular ancestor of green plants (Viridiplantae = Chlorobionta = Chloroplastida) may be the mixotrophs (with both photoautotrophic and phagotrophic nutrition) called "phycomate prasinophytes" (= single cells with large, thick-walled floating stages, or "phycomata").

  • Smith, G. M. (1938) Cryptogamic Botany, Volume I, Algae and Fungi, McGraw-Hill, New York and London.

    Although the construction of the earliest microscopes in the late 17th century by Antonie van Leeuwenhoek led to an initial study of microbial life, our understanding of the importance and vast diversity of these simpler "microorganisms" (often but not always limited to microscopic organisms also called "microbial forms" or "microbes") is still only in the beginning stages, even with important new advances in molecular biology (the study of structure and function of life at the biochemical level of organization, involving, for example, DNA, RNA, and proteins). It has been estimated that fewer than 2% of all microorganisms have been identified. With this small sampling of microbial life, the scientists are now attempting to progress more rapidly in their quest to understand the entire tree of life, which was largely initiated by the comparative study of small subunit ribosomal DNA sequences of a wider selection of known microorganisms. The small unit ribosomal DNA (= mostly, 16S or 18S rDNA) provides the genetic instructions (sequence of nucleotides) for the production (encoding) of small unit ribosomal RNA that plays a role in the small unit of the ribosomes (tiny factory-like subunits of the cell responsible for the manufacturing of proteins). See molecular characters. Recent molecular studies have generally reinforced the older proposals that most of the more complex, conspicuous, and better understood, multicellular organisms can be placed in the kingdoms Animalia, Plantae, and Fungi. However, the separate kingdoms "Monera" (for "bacteria") and the "Protozoa" or "Protista" (for the simpler eukaryotes, including the so-called "unicellular animals") that were first put forward toward the end of the 19th century have largely been discredited, little by little being eliminated from biology textbooks. The "prokaryotic organisms" ("bacteria") once lumped into one kingdom are now considered (by most biologists) to belong to two separate domains, Archaea (= Archaebacteria) and Bacteria (= Eubacteria). The use of the name Bacteria applied to one of these domains may be misleading, because this name has traditionally been applied to the paraphletic group of all "prokaryotes" [including both domains and excluding the domain named Eukarya (= Eukaryota) for all eukaryotes]. Furthermore, if the group named Bacteria (= Eubacteria) is eventually shown to be paraphyletic, it will no longer be considered a legitiment domain, which is suppose to be a primary line of descent (not including organisms of any other domain). Nevertheless, no matter what is finally decided, the concept of the three domains of all cellular life has already become so entrenched among scientists that these names will likely continue to be employed for a long time and, today, can be found in nearly all biology textbooks. The single-celled or simpler eukaryotes, once lumped into a single kingdom, are now known to comprise diverse groups not that closely related to one another. It was already recognized before the last half of the 20th century that the subgroup "Mastigophora" (~= "Flagellatae," often unicellular organisms called "flagellates," possessing flagella = tiny whip-like or hair-like extensions propelling the cells) consists of a polyphyletic assemblage of unrelated "protozoan" or "protistan" life forms. The same was eventually said for the subgroups once called "Sarcodina" [the "amoebas" = often single-celled (unicellular) organisms with a soft, gelatinous cell surface that can become extended as pseudopodia ("false feet"), which enable them to move about and capture (engulf) prey] and "Sporozoa" [often unicellular parasites forming a protective spore to get from one host organism to another]. Such "flagellates" or "amoebas" or "sporozoans" are now thought to be found in scattered clusters (unrelated groups) on both the so-called animal and plant side of the tree of life for all living neozoan eukaryotes.
    The old classical system of grouping "Protozoa" (more or less abandoned decades ago) was largely based on the work of Butschli (1880-1889), defining four major groups as "Sarcodina" (= "amoeba type organisms"), "Sporozoa" (~= "unicellular parasites"), "Mastigophora" (= "flagellates"), and Infusoria (= ciliates).
    The last major subgroup (the only group now recognized as a true lineage) of the old kingdom of "protozoans" was called Infusoria (= Ciliophora, the ciliates, including the familiar Paramecium). This subgroup of heterotrophs (not food producers, depending on other organisms for food) is now thought to be localized on the plant side of the tree for all living neozoan eukaryotes and placed within the larger group of alveolates, those organsms with a pellicle (a body covering within the cells that is more complex than just the surrounding plasma membrane); and the (peripheral but somewhat under the cell surface) pellicle is composed of distinctive, flattened, sac-like structures called alveoli, sometimes giving the cells a pitted or honeycombed appearance. Another group of organisms within the alveolates, are the Apicomplexa (including among others the malaria parasite) and mostly photoautrophic organisms (traditionally considered "algae" or "protozoa") called the dinoflagellates, many of which form plates of cellulose and other rigid materials surrounding the alveoli, therefore, developing a somewhat internalized cell wall.

  • Butschli, O. (1880-1889) Protozoa.
    Abt. I (1880-1882) Sarkodina und Sporozoa.
    Abt. II (1883-1887) Mastigophora.
    Abt. III (1887-1889) Infusoria und System der Radiolaria.
    In: Bronn, H. G. (ed.), Klassen und Ordnung des Thier-Reichs. Vol. 1, C. F. Winter, Leipzig. Pp. 1-616, 617-1097, 1098-2035.

    Since it is doubtful whether viruses are alive, the cell is the basic or smallest unit that makes life possible. On the basis of cell structure, Chatton (1937) divided all cellular life into two categories, eukaryotes versus "prokaryotes." The eukaryotes were defined as those organisms whose cells contained a membrane bound nucleus and certain other, membrane bound organelles (distinct 'organ-like' components or structures within cells that perform specific functions), while "prokaryotes" lacked these features. The cells of "prokaryotes" (the "left overs") were again (artificially) defined by their relative structural simplicity, and by the absence of many features found in the cells of eukaryotes. Some authorities restricted the definition of organelles to membrane bound structures within the cells that have a particular function, while others defined these functional structures more broadly. Therefore, the term 'organelle' can more generally apply to subcellular (within the cell) structures of both "prokaryotes" and eukaryotes; some of these structures (e.g., the centers of protein manufactor called ribosomes) in both groups can lack bounding membranes; but those organelles with one or more bounding membranes (other than the universal 'envelope' called the plasma membrane that surrounds the entire cell) are unique to eukaryotes and, therefore, absent in "prokaryotes." All these membranes (including the plasma membrane) are very thin, two layered films of fats (more specifically called phospholipids) with inserted proteins and sometimes other substances. However, there are inner membranes unique to eukaryotes, including those surrounding certain organelles, that are not derived from the plasma membrane but can often interact closely with it. Although some "prokaryotes" can possess internal membranes derived from their plasma membrane, these internal membranes are never found to surround organalles. Conventionally, the plasma or outer membrane is considered the boundary of all living cells, although most cells produce and secrete materials of one kind or another that make up a surrounding cell wall or an extracellular (outside the cell) matrix. Even though this material is conventionally considered to reside outside the cell, the study of these outer structures is central to any understanding of the cell because they are an integral part of cell functions. In eukaryotes, the internal membranes (unlike those of certain "prokaryotes") can be considered extensions of the membrane system that bounds the nucleus. Actually, the separation of eukaryotes from all other "left-over" life forms based on these somewhat cryptic (microscopic) differences was first suggested by Chatton (1925). The formal name for eukaryotes is still largely accepted as Eukaryota Chatton, 1925. Note that the date of publication by the author can be optionally included as part of the name.
    Although the distinction between eukaryotes and "prokaryotes" had already much earlier been made by Cohn (1875) (see single celled organisms) and more recently on the basis of internal cell structure by Chatton (1937), it took some time for Chatton's work to be generally accepted, possibly partly due to the reluctance of botanist (plant scientists) and phycologists (scientists that study "algae") to remove cyanobacteria (formerly called 'blue green algae') from their classification systems. It should be noted that there was never any major separation of eukaryotes from "prokaryotes" in the old two or three kingdom systems of classification, which largely applied only to multicellular organisms. It was mostly through publications of Stanier and co-workers (e.g., Stanier and van Niel, 1962; Stanier et al., 1963) that the eukaryote versus "prokaryote" distinction became widely acknowledged. The living material bounded by the plasma membrane of both "prokaryotes" and eukaryotes is now called protoplasm. In eukaryotes, the protoplasm other than in the membrane bound nucleus is called cytoplasm. All the organelles, including the usually centrally located nucleus and its internal membrane extensions, can be thought of as embedded in the cytoplasm. See short descriptions of the universal plasma membrane and internal membranes with an emphasis on fungi (a type of eukaryote). The cells of "prokaryotes" (including eubacteria and archaea) are limited to a few compartments, such as the plasma membrane, the cell wall (gram-positive eubacteria and archaea), the periplasm, and the outer membrane (gram-negative eubacteria), while the cells of eukaryotes feature numerous compartments (see last common ancestor), including the endoplasmic reticulum (ER), and the Golgi apparatus (see internal membranes), the tiny membrane bound sacs called vesicles and lysozomes that contain digestive enzymes, the larger membrane bound sacs called vacuoles, the plasma membrane, sometimes a cell wall, and the various organelles, such as the nucleus, plant chloroplasts, mitochondria, and peroxisomes, as well as sometimes even more internal compartments within certain organelles that can be surrounded by one or a few (2 or 3) outer membranes.

  • Chatton, E. (1925) Pansporella perplexa, amoebien a spores protegees parasite des daphnies, Reflexions sur la biologie et la phylogenie des protozoaires, Annales Science Naturelle Zoologie, 8, 5-84.
  • Chatton E. (1937) Titres et travaux scientifiques, Sete Sottano.
  • Stanier, R. Y. & Van Niel, C. B. (1962) The concept of a bacterium. Archiv fur Mikrobiologie 42, 17-35.
  • Stanier, R. Y., Doudoroff, M. & Adelberg, E. A. (1963) The Microbial World, 2nd ed. Prentice-Hall, Englewood Cliffs, NJ.

    In attepting to define what is usually meant by "microrganisms" versus "macroorganisms," those once formal or even informal group names with quotes represent artificial groups containing organisms that are not directly related. The group names whether formal or informal without quotes can be considered monophyletic or true lineages. The placement of what was eventually (1930s and 1940s) considered a separate kingdom "Monera" ("prokaryotes" or "bacteria") as a class of "plants" persisted into the twentieth century. Physicians still use the phrase "gut flora" for the microbes of the human GI tract. While "fungus-like organisms" and true fungi, as well as some "protists" and many "prokaryotes", were once considered plants and included (as some of the often less understood "left-overs") in botany or some "protozoa" were once considered animals and included (as often less understood "left-overs") in zoology, all these organisms (even the larger ones) are now often included in microbiology and considered "microrganisms" or "microbes" [i.e., all the "left-over" organisms (mostly but not necessarily microscopic) that are now not considered plants or animals]. These are the less conspicuous and less understood organisms (mostly microscopic) that would have been placed among the "cryptogams" or the so-called "unicellular animals" based on the old two kingdom classification of life. Some of these organisms are the ones that were once placed in traditional groups that are now largely considered paraphyletic or polyphyletic. The names of some of these traditional but artificial groups are still often employed only for convenience as "catch-all" categories in the study of superficially similar but often not directly related organisms. Although the majority of what are today called "microorganisms" (= "micro-organisms") include a diverse group of microscopic organisms that mostly exist as single cells or cell clusters, they are not limited to microscopic single cells (or cell clusters) or even cellular forms, because they have come to include microscopic but noncellular viruses, the mostly microscopic and always cellular "prokaryotes," and the larger cells of the eukaryotes often called "Protista" or "protists" [= "algae" plus "protozoa" (organisms sometimes called "protozoans"), as well as "fungus-like organisms"]. The "Protista" (= "protists"), including the "microbial eukaryotes" that are neither land plants, animals, nor true fungi, is considered an artificial group that includes (among others) organisms as diverse as green algae, red algae, glaucophyes, foraminiferans, chlorarachniophytes, radiolarians, oomycetes, brown algae, diatoms, golden algae, dinoflagellates, ciliates, apicomplexans, parabasalids, diplomonads, kinetoplastids, euglenids, cellular slime molds, plasmodial slime molds, entamoebas, and gymnamoebas. These have become the approximate "left-overs" of the three kingdom system of life. Therefore, even through they are not limited only to unicellular or microscopic organisms (some eubacteria can grow to macroscopic size and some "algae" and true fungi can cover hectares), the "microorganisms" (the modern, often less understood, approximate "left-overs" of the two kingdom system of life) are distinguished from the cells of the "macroorganisms" (= "macro-organisms"), which include those better understood, multicellular organisms considered animals and the land plants (or their aquatic embryophyte descendants). In other words, even though most of the "microorganisms" included in microbiology are microscopic organisms with single cells that can carry on life processes of growth, energy generation, and reproduction independently of other (alike or different) cell types, this area of study also includes some larger unicellular or multicellular organisms that are not considered plants or animals. Furthermore, not only are the majority of the organisms on this planet, including most eukaryotes, now considered "microorganisms" (or "microbes"), but also some of the multicellular eukaryotes now considered "microorganisms" (e.g., certain fungi comprising a huge, underground network called a mycelium of simple filaments of cells that produces the surface growing fruiting bodies called mushrooms) are among the largest life forms on the planet. Among the "protistan eukaryotes" (or "protists"), the unicellular or multicellular, phototrophic "algae" include organisms mostly with cell walls and almost always with chlorophyll containing chloroplasts, while the unicellular "protozoa" are mostly phagotrophic (= phagocytic) and mostly without cell walls, always nonphototrophic without chlorophyll containing chloroplasts (except for the enigmatic microscopic organisms with both "animal-like" and "plant-like" features, such as euglenids and chlorarachnophytes, that are also considered "algae"), usually colorless and motile [except for the sporozoans (Apicomplexa or Sporozoa) that are nonmotile and parasitic], often with motility structures called cilia (Ciliophora) or flagella ("Mastigophora") or amoeboid ("Sarcodina" or "Amoebae") with streaming of cytoplasm resulting in pseudopodia, and never aggregating (like in "slime molds") to form fruiting bodies or masses of protoplasm. The euglenids can be considered both "algae" and "mastigophorans" ("flagellated protozoans"), because in darkness they can spontaneously lose their chloroplasts and become completely heterotrophic organisms. This is not surprising, since euglenids are actually closely related to the flagellated protozoan Trypanosoma, a parasitic genus (thus completely heterotrophic) that includes species that can cause a number of diseases in vertebrate animals, including African sleeping sickness in humans. The dinoflagellates are also often considered both "algae" and "flagellated protozoa" with a close relationship to Apicomplexa and Ciliophora. The "fungus-like organisms" include among others the "slime molds" that lack cell walls (similar to "protozoa") but that aggregate to form fruiting bodies (cellular slime molds) or masses of protoplasm (acellular slime molds).

    Although the succession of many other ancestral events must be explained to get a fuller understanding of the plants called trees and in turn the flowers, fruits, and seeds of the herbs, shrubs, and trees of flowering plants (angiosperms), these were (from the standpoint of the human history of western botany) some of the first more conspicuous plants or plant parts to be recognized and studied. However, in order to truly understand trees, and the flowers, fruits, and seeds of the herbs, shrubs, and trees of angiosperms, a bio-historic perspective (from the standpoint of biological evolution) is necessary, concentrating on the descent with modification that led to the simplest, historically (from the standpoint of the history of botany) least understood land plants and their "streptophyte green algae" relatives, which are descendants from earlier forms of life that were often even less understood. This step by step descent with modification started about 4 billion years ago with very simple life forms and has culminated in the dominance of angiosperms from the Cretaceous to the present (see also early fossils). In order to really understand plants, this bio-historical perspective is necessary. Without it, structures like chloroplasts, woody trees, seeds, and fruits or processes like the land plant life cycle make no sense whatsoever. In the description of the wide diversity of medicinal organisms featured in this work, this is the perspective that is emphasized. However, from the standpoint of the history of botany, the more recently derived, often more conspicuous organisms were the first to be recognized and studied, more or less leaving for the last the study of the often less conspicuous descendants of the more ancient, often simpler forms of life. It was not until around 1840 and soon after that studies with the help of the microscope on plant sexuality and embryology was no longer confined to the phanerogams (seed plants) but was extended to the higher and later on to the lower "cryptogams" ("non-seed plants"). In the year 1850, comparative studies by Hofmeister of the formation of the embryo and alternation of generations in phanerogams, "vascular cryptogams" (= "pteridophytes" = ferns and "fern allies"), and mosses were beginning to unravel the true nature of the seed. However, the true nature of the lower "cryptogams" once called the "thallophytes" (including "algae," "fungi," "bacteria," etc.) were the last to be recognised. By 1852, systematic relations between past and existing floras, established through the comparative study of the fossils and living plants by Unger, showed that the immutability of species is an illusion. However, it was not until the revolution in biology started by Charles Darwin that the bio-historic perspective eventually became basic to taxonomy. According to Kevin de Queiroz (1997), the next stage in this revolution will probably involve the extention of the central role of descent with modification into the realm of biological nomenclature (the scientific naming of living and fossilized organisms and their lineages).

  • de Queiroz, K. (1997) The Linnean hierarchy and the evolutionization of taxonomy, with emphasis on the problem of nomenclature, Aliso 15:125-144.

    Much confusion in names (the same name for different organisms or different names for the same organisms) has often resulted from attempts by authorities to define ranks for the plants that they are trying to classify, especially when the kingdoms are defined differently from one author to the next. For example, some literature sources might define Plantae Haeckel, 1866 as the questionable lineage (also called Archaeplastida), including all the purported descendants of the first eukaryote with oxygenic photosynthesis, while other sources may apply Plantae (with the same author and publication date of the name) to only the land plants. The use of qualifiers, such as sensu lato versus sensu stricto may be used to distinguish these two applications of the same name. The first could be called Plantae sensu lato, while the second could be called Plantae sensu stricto. The same name Chlorophyta can also apply to different groups, such as all green plants (a lineage), "green algae" (a grade), or only (as above) a lineage portion of the "green algae" grade. The name Charophyta includes (as above) all organisms that can be referred to as streptophytes sensu lato or only the group of streptophytes sensu stricto in the order Charales, thought by some but not all authorities to be likely most closely related to green land plants.

    However, the problems with ranks can be mostly seen as the result of the tremendous progress in identifying the major lineages of organisms within the last few decades. Because of this progress, a particular formally named lineage may be placed within so many larger lineages, each requiring a formal name, that not enough ranks or taxonomic levels exist to easily label this hierarchy. Therefore, this problem is very simple. There are more nested sets of lineages now known than can be easily accommodated by the traditional species to kingdom hierarchy.

    Take for an example the group organisms referred to as Achillea millefolium L. (= Yarrow), a species that is a member of the genus Achillea L., which is part of the Eurasian grade of the tribe Anthemideae; and this species can be found wild not only in Europe, Asia, and North Africa, but also in western North America and Mexico.

    If all known major lineages that contain Achillea millefolium up to the domain Eukaryota (= Eukarya) are listed, this species would have to be grouped in a nested hierarchy including Achillea (genus), Matricariinae (subtribe), Anthemideae (tribe), Asterodae (supertribe), Asteroideae (subfamily), Asteraceae (family), Asterales (order), Apiidae, Campanulidae, Gentianidae, Asteridae, Pentapetalae, Gunneridae, Eudicotyledoneae, Mesangiospermae, Angiospermae (flowering plants), Spermatophyta (seed plants), Lignophyta, Euphyllophyta, Tracheophyta (vascular plants), Embryophyta (embryophytes, commonly called land plants), Streptophyta, and Chloroplastida [= Viridiplantae].

    In turn, Chloroplastida might (?) be nested within Archaeplastida, which seems (?) to be nested in an informally named lineage sometimes referred to as cordicates, which has recently been proposed to be nested within the group now called the neozoans within the group of neokaryotes (the "core excavates" plus the neozoans) within the domain or superkindom Eukaryota. This hierarchy is almost certain to be correct up to and possibly somewhat beyond the level of Chloroplastida; and it would, of course, be useless to attempt to show that Achillea millefolium is not a member of the monophyletic domain Eukaryota.

    However, at the level of the domain Eukaryota, if all the known lineages are named, it would be very cumbersome to try to fit or accommodate Achillea millefolium along with other organisms into a traditional hierarchy that permits a limited number of conventional ranks. Almost any of the names of the known lineages above the rank of order would have to be changed to a name with an appropriate suffix; some unconventional intermediate ranks (e.g., supersubdivision) could be used; or more than one classification system could be employed, one or more for the higher ranks and another for the lower ranks. For example, in one classification system, Archaeplastida could be considered the kingdom in an attempt to accommodate some of the higher level names down to and including the name for embryophytes. In another (separate) classification system, Chlorobionta could be considered the kingdom in an attempt to accommodate names for many of the higher level lineages of "green algae" in relationship to embryophytes. In still another (separate) classification system, the embryophytes could be considered the kingdom in an attempt to accommodate many of the lower levels, including all the classes, orders, and families of ferns and the classes of seed plants. In a final classification, the names ranked as classes of seed plants of the last mentioned system could, perhaps, be ranked as supersubdivisions (or some other unconventional intermediate rank) of the division Spermatophyta. Although some of the same lineages are included in these different classification systems, the change in rank requires different names for the sames lineages in one classification system versus another. The creation of different names for the same lineages violates the principal of having only one name for any group of organisms that descend from a single common ancestor.

    Somewhat of the same problem exists for the classification up to eukaryotes for our species:
    Homo sapiens (species), Homo (genus), Homininae (subfamily), Hominidae (family), Hominoidea (superfamily), Catarrhini (parvorder), Simiiformes (infraorder), Haplorhini (suborder), Primates (order), Euarchonta, Euarchontoglires (superorder), Boreoeutheria, Eutheria (infraclass), Theria (subclass), Mammalia (class), Amniota, Tetrapoda, Dipnotetramorpha, Sarcopterygii (bony fish and descendants), Teleostomi (bony vertebrates), Gnathostomata (jawed vertebrates), Vertebrata, Craniata (subphylum), Chordata (phylum), Deuterostomia, Bilateria, Eumetazoa, Metazoa, Opisthokonta (kingdom), and Eukaryota (domain or superkindom).

    Even though classification systems that 'reflect' well supported relationships between true lineages can sometimes be based on a hierarchical structure of ranks, such systems of names tend to be awkward and difficult to construct. Nevertheless, these so-called rank-based phylogenetic classifications are still in common use. See working classification of "green algae" and land plants by Lewis and Mc Court (2004). However, because of various problems and limitations of the traditional species to kingdom hierarchical systems, a recent trend in systematics permits (although this does not require) the abandonment of ranks. This allows ranks to be optional so that the system of names can be more consistent with a binary tree-like hierarchical structure of relationships between organisms based on lineages and sister groups. Uses of informal unranked plant names above the level of order have become common. However, care most be taken to avoid applying the same informal name for more than one lineage. The ranking of groups in a species to kingdom hierarchy can be arbitrary and include some of the most subjective aspect of traditional taxonomy. The changing of the ranks and, therefore, the names (= name changes due to shifts in rank) can lead to far too many names for the same lineages. There should be a way to easily name lineages (even as they are being discovered) one at a time (just like naming species) without the worry of fitting them into a new or preexisting rank based classification. Because of the potential problems or limitations with mandatory rank based systems, a multitude of newly uncovered and well-supported lineages would often be left unnamed, causing taxonomy to lag far behind knowledge of genealogy. Therefore, the divorcing of naming from ranking is especially needed at a time when advances in molecular biology and computer technology are rapidly generating so much new information about the relatedness of organisms. This fortunately does not mean that every lineage in a branching and rebranching genealogy must be named. However, those that are named should be not only well supported as monophyletic groups but should also be at least easily recognizable. Furthermore, the names of well-supported lineages that are also well established in the literature should be preserved. Name changes should be minimized as much as possible. Although (in compliance with the standards of ICBN) there is an attempt to use (as much as possible) the oldest standard names that apply to well defined lineages, especially at or below the traditional rank of class or order, none of the various names applying to the ranks themselves of traditional classification systems of various authors are emphasized in this dictionary, which stresses the grouping of organisms and the naming of groups based genealogy.

    Hierarchical structure of levels (similar in some ways to the systematic arrangement attributed to Carl Linnaeus) is still more or less used today. However, classification of living organisms is often based (as much as possible) on a tree-like diagram representing genealogy that is reconstructed using more refined methods than those solely based on overall similarity of characters (see phenetics versus cladistics). Although sometimes yielding apparently favorable results in grouping plants or other organisms with distinctive characteristics, overall similarity methods have often failed to provide reasonably accurate estimates of genealogy. Currently, there is an emphasis on isolating distinctive features that share a common ancestry (referred to as shared divergent or derived characters) in defining lineages and sister groups. This can be thought of as the grouping of living things on the basis of shared changes from ancestrally less derived to more derived or divergent conditions due to evolution. Therefore, the branching pattern of a genealogical tree (estimated on the basis of uniquely shared changes from certain ancestral features) can be thought as due to divergence from ancestors to descendants, also referred to as diversification or evolution (descent with modification). See some simple examples. On another web page, some examples of shared derived characters of medicinal value are given for a subfamily of the mint family. Could this subfamily represent the most commonly used group of plants of its size on the planet?

    Genealogy (= phylogeny) can be defined as the study of the descent with modification of living organisms from earlier ancestral forms or the (natural evolutionary) relationships of these organisms proposed on this basis and often represented by a tree-like diagram called a genealogical tree. There is much effort today in biology (the study of life) to eventually represent all the diversity of life as a single (very large) genealogical tree called the tree of life. This diversity of organisms comes about through a process referred to as diversification or evolution (descent with modification of certain characteristics). All organisms, living and extinct, fall into systematic arrangement, an orderly series of successively larger and larger groups subordinated to each other on the basis of similarity (particularly shared divergent characteristics). That the diversity of life is not a set of completely unique organisms but a nested hierarchy of lineages of organisms that share divergent similarities is probably the most convencing support for biological evolution. The evolutionary perspective is now generally becoming the most important approach to plant description, identification, classification, and even plant naming. However, this genealogical approach has only gradually developed in the last few decades (since the 1960s) from earlier refinements of the concept of biological evolution first introduced by Charles Darwin (1859) in The Origin of Species. Even though the objectives of the fathers of traditional taxonomy had nothing to do with any concept of biological evolution, they (by placing all known organisms into a logical classification, which was often believed would reveal the great plan used by the Creator - the Systema Naturae), laid the framework for later evolutionary schemes by dividing organisms into a hierarchic series of taxonomic categories, starting with kingdom and progressing down through phylum, class, order, family and genus to species. In the 18th and early 19th centuries, naturalists likened this hierarchic series to a 'tree of life,' a notion that was adopted by Charles Darwin as a means of describing the 'branching' evolutionary histories of all known living organisms (including fossils).

    Although closely related organisms have overall more similarities in their characters than more distantly related ones, it is important to distinguish primitive or less derived characters from those that are more advanced, divergent, or derived and establish groups at different levels of the hierarchy on the basis of shared derived characters with a common ancestry (an approach to grouping organisms already mentioned but discussed in more detail below). What is considered a divergent (advanced) character at one level can be considered an ancestral (primitive) character at a higher level on the tree of life. Therefore, both divergent and ancestral characters are actually included in the reconstruction of the evolutionary history of organisms represented by a genealogical tree; and it depends on the level of the hierarchy whether a given character is divergent or ancestral.
    An example of such a hierarchy of groups in animals could be humans (e.g., with language able to express symbolic thought, fire used in cooking food), primates [e.g., with grasping hands or feet, often composed of a few opposable digits with skin ridges allowing for finger or toe prints, flattened finger or toe nails (not narrow claws), forward-facing eyes close together on front of face allowing for binocular and stereoscopic vision, relatively large brains, short jaws, flat faces, and extended parental care of offspring compared to other mammals], mammals (e.g., with hair and milk secreting glands, differentiation of teeth (= different types, such as canines, molars, etc., not all conical or uniform in size and shape)], amniotes [e.g., animals bearing complex eggs with internal membrane bound compartments, including the membrane bound amnion with an internalized pond-like fluid surrounding the embryo that develops from cell division of zygote (= fertilized egg cell, ovum, or female gamete)], tetrapods [e.g., with four limbs or legs with digits, pharyngeal clefts (grooves along sides of pharynx) giving rise to parts of ears, glands, etc. (never giving rise to gill slits as in other vertebrates), ears able to detect airborne sounds], vertebrates [e.g., with series of vertebrae of cartilage or bone, comprising a backbone], etc.
    A common hierarchy for plants could be flowering plants or angiosperms [e.g., with true flowers that bear fruit, a detailed example given involving pea plants], seed plants [e.g., with seeds], vascular plants [e.g., with well developed water and food conducting tissue], polysporangiophytes [e.g., sporophyte with branches bearing multiple spore sacs], land plants [e.g., with distintive embryo (developing from cell division via mitosis of zygote) that is at least initially attached to (dependent on and often nourished by) a gametophyte and enclosed within a protective structure], streptophytes [= land plants plus closest water inhabiting living relatives of the land plant ancestor that have cell division involving a structure called the phragmoplast of minute tubules associated with minute, membrane bound, sac-like vesicles], etc.
    At least one shared divergent character in brackets in the prior sentences for animals and plants is used to help define each named lineage (composed of a single ancestral species and all its descendants), starting (in a hierarchy) from the least inclusive groups and ending with the more inclusive ones. In using this dictionary, it would be helpful to learn the important characteristics that can be used to define these major levels of the plant hierarchy, as well as the higher level lineages for vascular plants (lycophytes and euphyllophytes). Each shared derived character, when unique to a particular lineage or branch of descent, can be considered a character that can serve as a marker (shared change) useful for identification of this lineage. The major branches of the so-called tree of life can be referred to as higher level lineages often supported by recent DNA evidence (as well as often distinctive morphological characters). See more on what is meant by lineages and sister groups in the next paragraph.

    Lineages and sister groups

    A lineage can be defined as a group that must include a single ancestral species or most recent common ancestor (MRCA) and all its descendants. These descendants may also include lineages [often represented as branches (of descent) in a tree-like diagram (a genealogical tree)], but they must all be branches that stem directly or indirectly from the same common ancestor. According to Doyle & Donoghue (1993), a crown group (= grown lineage) includes the MRCA of the presently living members of a lineage (= clade) and all its descendants (= derivatives) and not the fossil members of the stem groups (= stem relatives, stem lineages, or stem clades) that gave rise to the crown group or lineage. Although genealogical (phylogenetic) tree-like diagrams always represent an oversimplification, their branching, hierarchical structure (= topology) provides just enough information to make it much easier to understand the evolutionary history of organisms. Therefore, the structure of these tree-like diagrams is commonly used to illustrate the nature of lineages as apposed to "artificial groups" that are either paraphyletic or polyphyletic. In these diagrams, each labeled tip, which could respresent a species, genus, family, order, class, division, kingdom, or even domain, is called a taxon (plural: taxa); the internal nodes represent the most recent common ancestor of a given collection (group) of descendant taxa; the root node represents the MRCA of all the taxa of the tree; the root branch (or root) and the branches that connect the taxa, internal nodes, and root node can represent evolution or shared divergent changes in the states of characters over time; the nodes also represents the points at which common ancestors split (diverge or bifurcate) along at least two branches; and the external branches directly connect each terminal taxa to its MRCA, while the internal branches connect the internal nodes to other internal nodes or the root node. The nodes can be considered taxa only if they represent particular named ancestral organisms, such as specific known fossils. The most important aspects of the structure of such a tree are the order of branching (representing evolutionary history of the taxa) and the groupings of taxa by their MRCA (representing lineages or clades). If such a tree is represented vertically, it is called a vertical tree, where the root is at the bottom and taxa are the tips at the top. In such a tree, the left-to-right order of the labeled tips has no meaning, because the subtrees at the internal nodes or the entire tree at the root node can be freely rotated (spun at the nodes), thereby reversing this order. The tree after any such possible rotation is considered identical (in meaning in terms of evolutionary history) to the prior tree. The rotation of the entire vertical tree 90 degrees results in a horizontal tree, with no effect on the branching order of the nodes and taxa or the groupings of taxa by their MRCAs. The vertical axis (y-axis) of the vertical tree or horizonal axis (x-axis) of the horizonal tree represents time from the past to the present. The points on these axes can be used to estimate the time of the past splitting of the root node, internal nodes, and external nodes, leading terminally to the present taxa. The resulting groupings in these trees are said to be monophyletic, if and only if each of these groupings includes nothing else except a single node and all the descendants of this node. A lineage (= clade) is always a monophyletic group.

  • Doyle, J.A. & Donoghue, M.J. (1993) Phylogenies and angiosperm diversification, Paleobiology, 19, 141-167.
  • The root or root node is the proposed oldest and most important point on any genealogical tree (= phylogenetic tree-like diagram). It represents the most recent common ancestor (MRCA) [also called the last common ancestor (LCA)] of everything in the tree. The root indicates the relative order of branching events or the direction of evolution within the tree. In other words, the placement of the root determines which characters are likely ancestral (most "primitive") versus derived for all organisms in the tree. In terms of which characters are ancestral versus derived, it makes a big difference whether the root is placed betweem Archaea + Eukarya and Eubacteria (as in the traditional tree of life) or within Eubacteria in either gram-negative or gram-positive prokaryotes. See possible characters of the single cells of the proposed last common ancestor, according to the more recent hypothetical placement of the root for the tree of all known eukaryotes. The root also indicates which groups are lineages (or "true" groups). If the root is found to be placed within some proposed "group," this assemblage of organisms is not considered a lineage but rather an artificial group called a "grade." Any resemblances between the taxa of this grade assemblage of organisms are not shared derived characters (or unique defining features) but rather "primitive" (ancestral) characteristics that have been retained from their MRCA, which is also the MRCA of everything else in the tree.
  • The relatedness of organisms (= taxonomic affinity or how recent the organisms in question share a common ancestor) can also be assessed by accurate phylogenetic tree-like diagrams, because out of three organisms or groups, the two with a more recent common ancestor (node closer to the top of a vertical tree) are more closely related to each other than to a third organism or group that shares (with the other two) a more distant (from the top) MRCA. Two taxa are more closely related to each other than to a third taxon, if the two taxa share a more recent common ancestor (a more recent node) with each other than the joint common ancestor (a more distant or earlier node) of all three taxa.
    For example, in the traditional tree of life, E = Eukarya and A = Archaea appear more closely related to each other than to B = Bacteria (= Eubacteria). E and A appear as sister groups and B appears as sister to the group comprising both E and A.
    Below is the basic structure of the traditional tree of life, where E = Eukarya, A = Archaea, and B = Bacteria (= Eubacteria). The proposed 'root node' is represented by '-' toward the base of the tree. Some authoritites purport that the 'root' actually lies somewhere within B and not, as shown here, between E + A and B.
    E   A   B
     \ /   /
      -   /
       \ /
        | root
    The related paragraphs below end in a further discussion of sister groups that are descendants of a single node or the same MRCA. They have originated at the same split or bifuration of the tree. Any such split of a tree node is considered to have occurred at the same time. Therefore, any two lineages, a taxon and a lineage, or two taxa that split from a common node at the same time or that are the closest relatives of each other (share a common node or single MRCA) are considered sisters or sister groups of each other. Because they are descendants of the same (single) node, the grouping together of two sister lineages, a taxon and its sister lineage, or two sister taxa results in a more inclusive lineage or monophyletic group.
  • Polytomies (= three or more branches connected to a single node) are most often used to indicate uncertanty in branching patterns. In this case, the branching order is unknown. Only rarely does this polytomy represent a sudden burst in the origin of three or more taxa from the same most recent common ancestor.
  • If only a portion of the descendants from a single ancestral species (a node representing a MRCA) are included in defining a group, this is called a paraphyletic group. Because biologist can define terms in slightly different ways, some confusion or ambiguity can creep in. According to some authors, a paraphyletic group is monophyletic (with only one, most recent common ancestor), but it is not holophyletic (does not consist of all descendants from its common ancestor). Therefore, only a holophyletic group (in this definition) represents a true lineage. According to these authors, a paraphyletic group is a monophyletic group from which at least one of its lineages is excluded and considered a separate group from the rest. For example, if birds are excluded from reptiles, then reptiles without birds is paraphyletic (reptiles are said to be paraphyletic to birds), because birds and other reptiles have been found to descend from a single common ancestral species. Lizards without snakes is also paraphyletic (lizards are said to be paraphyletic to snakes), because snakes represent one lineage, the terminal or most derived lines of descent or branches that have lost their legs, with a shared common ancestry with all lizards (including some other venomless and legless ones that are not considered snakes). The lineage that includes snakes also includes venom producing lizards (e.g., Gila monster). Incidentally, it is this group that is now under investigation as the most derived holophyletic subgroup (sublineage of the more inclusive lineage that includes all lizards and snakes) in hopes of locating medically valuable agents. Although not all snakes are poisonous (an example of an inconsistency due to secondary reduction), the production of various kinds of defensive venoms together with other characters can be considered distinguishing markers for a holophyletic subgroup (sublineage) that includes both poisonous lizards and snakes. This is because within the more inclusive lizard lineage, venoms are commonly produced by members of only one holophyletic subgroup and never produced (within the lineage) outside the sublineage. Even the non-poisonous snakes and lizards within this sublineage have been found to produce at least small amounts of venom that could potentially be of medical interest. The prefix mono- means single or only one, holo- means whole or entire, and para- possibly means along side but not all and separate from the rest, while phyletic (at least according to an older definition) can pertain to a phylum, tribe, race, or any group of organisms, related by descent from a common ancestral form.
  • Many authors refer to groups that are both monophyletic and holophyletic as just monophyletic (defined in the strict sense as including a single common ancestor species and all its descendants, i.e., monophyletic = holophyletic), while those that stem from a single common ancestor but are not holophyletic are considered paraphyletic (include a common ancestor but not all its descendants). Therefore, according to these authors, a paraphyletic group is not monophyletic in the strict sense. Such a group can be the most common example of a grade (a group that shares the same degree or level of organizational complexity). On the tree of life, an important grade, including a step-wise sequence of branches with one or more terminal branches excluded, is sometimes singled out [e.g., the paraphyletic group, collectively including only liverworts, mosses, and hornworts, called "bryophytes" (excluding vascular plants)]. Quotation marks are often placed around the name of a grade, because it is not necessarily a true lineage, and it is definitely not one (according to many authorities in biology), if it only includes a portion of all the descendants from a common ancestor, even though each of its step-wise branches may themselves be considered lineages. For example, the liverworts, mosses, and hornworts without a vascular system (well developed water and food conducting system) represent living members of the earliest step-wise sequence of branches of plants that produce a distinctive protected embryo. Although each individual branch (the liverworts, mosses, or hornworts) of this step-wise sequence can be considered a lineage, all three branches taken together do not constitute a lineage, because other plants with a vascular system that belong to the same protected embryo producing ancestry are not included. Plants with a vascular system that do not produce seeds do not constitute a lineage, because other plants with seeds that belong to the same vascular system producing ancestry are not included. Sometimes grades are defined, because for various reasons all the living descendants from an ancestral species are not yet recognized. Two overlapping step-wise sequences of branches at the base of the fungi tree of life are undoubtedly grades, but they are still often considered taxonomic groups, because authorities are not yet sure how to divide them up properly into valid lineages. Such problems arise when the arrangement of branches in certain portions of the tree is not yet well defined. Therefore, a paraphyletic group includes a most recent common ancestor and some (possibly even a majority) but not all of the descendants of this ancestor. However, if all the missing relatives eventually become recognized and also included in a prior paraphyletic group, this modified or redefined group can be considered monophyletic (= a lineage or clade).
  • If a defined group is later found to not even include its most recent common ancestor (with some of the descendants of this ancestor also absent), this group is, of course, not a lineage. Such a group will contain some members of two or more subgroups with unrelated MRCAs. Such a collection of organisms is called a polyphyletic group, because it comprises members of two or more subgroups derived from unrelated ancestors; often some of the descendants of these unrelated ancestors are absent; and (most importantly) the single common ancestor (together with some of its descendants) of the entire assemblage is absent. Of course, the prefix poly- pertains to many that differ from each other, while, again, phyletic refers to descent. Some superficially similar looking organisms that form a grade (with the same level of complexity of, for example, their body plan) can sometimes represent a polyphyletic group. Such a group can be the result of independent (convergent) biological evolution of similar looking but unrelated organisms. In animals, such a group might include all superficially similar looking, worm-like organisms from differing lines of descent or branches that are not all connected to a single common ancestor (other than some remote ancestor and some of its descendants that are not even included). If spine bearing, succulent euphorbs and superficially very similar looking cactus plants were both grouped together, this "group" would represent a polyphyletic grade. All animals that can fly and all flowering plants with blue flowers also comprise polyphyletic groups that are not lineages or clades. A polyphyletic group of flying animals might include birds and bats, but exclude their joint common ancestor and many of its descendants.
  • According to some authors, although grades can sometimes be monophyletic in the strict sense, they are not necessarily so, and they can more commonly represent paraphyletic or sometimes polyphyletic groups. All living non-flowering seed plants might be said to represent a "non-flowering seed plants" grade (also including fossils), but all living members of this grade might constitute a lineage. All living vascular plants that are not lycophytes might be considered by some a grade that is also a lineage. The quotation marks around the name of such a grade can be omitted, if it is certain that it is a true lineage. However, according to many authors, a grade should always be an artificial group (not a true lineage, never holophyletic) that is frequently paraphyletic and sometimes polyphyletic. All authors agree that a grade (whether considered sometimes or never a lineage) is a group that represents some similar degree or level of evolution, organization, or adaptation. Some authors state that organisms can be grouped by their grade (degree or level) of organization without making any claims about whether they are monophyletic, paraphyletic, or polyphyletic. However, whenever this is done, there is no guarintee that the grades are true lineages. They could easily comprise collections of organisms that are paraphyletic [do not contain all organisms that descend from one ancestor] or sometimes polyphyletic [contain superficially similar organisms that descend from more than one (unrelated) ancestor]. Therefore, in this work, the term "grade" is restricted to organisms with a similar level of organization that are either paraphyletic or polyphyletic and never monophyletic in the strict sence. A good example of a polyphyletic grade of animals could comprise those organisms called "slugs" that have not retained their shells. The members of this group can be said to lack a single common ancestor, because shell loss has taken place more than once in snail-like organisms that have originated from two or more different ancestors. A good example of a paraphyletic grade of plants could again be the "bryophytes" or "non-vascular embryophytes" (including liverworts, mosses, and hornworts), because all these plant have the same common ancestry that evidually led to the excluded group called the vascular plants.
    If non-lycophyte vascular plants that were once placed in the class Pteropsida (pteropsids), including living ferns plus seed plants (cycads, the genus Ginkgo, conifers, gnetophytes, and angiosperms), are defined [according to Jeffrey (1903) or Arnold (1948)] as vascular plants with well-developed, many veined leaves, modified from branch systems, and usually with leaf traces associated leaf gaps in the cylindrical water and food conducting system (= stele) of the stems, this group excludes the genera with simpler, single veined or reduced leaves without leaf gaps, such as Psilotum, Tmesipteris, and Equisetum. [On the plant tree of life, these genera that were excluded from the pteropsids are now thought to possibly belong (together with the ophioglossid ferns) to the earliest branching lineages of monilophytes (see below).] In contast to the genera Psilotum, Tmesipteris, and Equisetum and the lycophytes that all possess smaller, so-called microphyllous leaves, the pteropsids were characterized by a type of vascular cylinder (water and food conducting system) of the stem (often a type of stele called a siphonostele) that is strongly influenced by the development of the larger, so-called macrophyllous leaves and their associated water and food conducting traces, which branch from the vascular cylinder and extend into the leaves, often forming gaps in the cylinder comprised of less specialized cells called parenchyma just above each trace. The parenchyma of the gaps extends to the base of the leaves and becomes continuous with the parenchyma of the center area of the stem called the pith. It was traditionally thought that this trend in the organization of the first formed water and food conducting system of the shoot culminates with the eustele, a ring-like arrangement of separate bundles of conducting cells that consists primarily of leaf traces. The bundles of the ring are separated from each other by parenchyma between them and continous with that of the more outer, softer part of the stem called the cortex and the more central, softer pith area. However, it is likely that the parenchyma between the separate bundles of such a dissected ring-like eustele in some plants has no consistent relationship to the leaf traces. In the normal eustele common in seed plants, the vascular system is dissected due to the occurrence of distinct bundles (= sympodia) and not due to leaf gaps as in the siphonostele of many ferns. Each bundle of the eustele consists of water conducting cells flanked externally by food conducting cells. The formation of a pith at the center of an ancestrally lobed or ribbed, often star-shaped, first formed (primary) vascular cylinder called an actinostele [a type of protostele (characterized as a pithless or solid vascular cylinder)] left the lobes stranded as a ring of separate vertical vascular bundles called sympodia (singular: sympodium) that run parallel to the stem axis between the cortex and the pith. The connected cortex and pith between separate vascular bundles of this type of eustele is not due to leaf gaps as in the dissected vascular systems of some ferns. Without leaving leaf gaps, the leaf traces diverge or branch directly from the sympodia. Although quite distinctive from the vascular system typical of ferns, the eustele common in seed plants was falsely often traditionally considered a type of siphonostele called a dissected ectophloic siphonostele. However, the water and food conducting system of the roots, which, of course, lack leaves, often remains a solid cyclinder similar in development to that of the above ground shoots or stems of the lycophytes. It is now generally accepted that the monilophytes that collectively include Psilotum, Tmesipteris, Equisetum, and all the plants traditionally considered ferns together with seed plants share a (more inclusive) common ancestry with the so-called pteropsids. DNA and fossil evidence provides support that the simpler leaves of Psilotum, Tmesipteris, and Equisetum are the result of reduction in complexity; and these three genera together with the so-called pteropsids form a well supported lineage now called the euphyllophytes that are considered the sister group of the lineage of lycophytes. The last mentioned lineage does indeed appear somewhat transitional between the "bryophyte" grade of earlier branching lineages and the later branching euphyllophytes in terms of level of compexity of the vascular system of the leaf bearing stem. Within the lineage of euphyllophytes, the sublineages of presently living monilophytes and seed plants appear as sister groups. Therefore, the so-called pteropsids (= Pteropsida) as a subdivision of vascular plants is usually no longer employed in plant classification or sometimes considered a partial synonym of the lineage of monilophytes, but more commonly applied to a paraphyletic group or grade not including seed plants and originating from the same ancestor as the lineage of monilophytes (Cantino, et al. 2007).
  • Arnold CA (1948) Classification of gymnosperms from the viewpoint of paleobotany, Botanical Gazette 110: 2-12.
  • Jeffrey EC (1903) The structure and development of the stem in the pteridophyta and gymnosperms, Philosophical Transactions of the Royal Society B: Biological Sciences 195: 119-146.
  • An understanding of what is meant by 'sister groups' can be very useful for describing the arrangement of lineages represented by the 'branches' and 'nodes' on the tree of life. Sister groups simply refer to two lineages or two species, that together form a more inclusive lineage. Of course, a sublineage is a lineage contained within a more inclusive lineage. If a lineage is composed of two sister lineages, then each sister lineage is a sublineage of its more inclusive lineage. It is genealogical (ancestor-descendant) relationships (= evolutionary relationships) between true lineages or monophyletic (= holophyletic) groups, often represented by branches, that is most important in locating where to find certain medicinal properties on the tree of life. See genealogical focusing. For example, there is currently a focus on the lineage of poisonous lizards and snakes in hopes of discovering useful drugs. The most dense clustering of folk medicinal uses in the mint family tree appears to correspond to the lineage defined as the subfamily Nepetoideae. Most of the rest of the subfamilies included in this tree-like diagram, with the exception of the basal subfamily Symphorematoideae, appear to represent the sister group of the subfamily Nepetoideae. See if you can find examples of other sister groups in the tree-like diagram for the mint family. Why should so many folk uses tend to congregate within the well marked lineage called the Nepetoideae? See further comments. Such a lineage is well marked, because certain shared divergent characters, including those from DNA, act as markers to uniquely distinguish it from other lineages. What character might be responsible for such a dense clustering of folk uses? Could the Nepetoideae represent the most intensely used medicinal group of plants of its size on the planet?

    In order to define lineages on the basis of characters used to describe them, there is a need to focus on the changes or divergences from corresponding ancestral conditions. This can be thought of as the grouping of living things on the basis of shared changes (from ancestral to divergent or derived conditions) due to biological evolution. Homologous characters (features with a common ancestry) can be represented by a change from a primitive (often simpler) state to a more advanced or derived (often more elaborate) state. These differences, due to changes with a common ancestry, represent two or more states of the same character; thus, they are called character states, which can, for example, be coded 0,1 or 0,1,2,3, where the lower numbers usually represent more primitive states and the higher numbers more advanced or derived states. If character states are represented by only 0 or 1, this is called binary coding. The successive increase in these numbers can be thought of as steps in evolution. The multi-state characters (those with more than two states) are often treated as unordered (no assumptions are made about whether any of the states are more or less derived than any other) and the steps of evolution are estimated by the methods used to analyze this coded information, often represented by a two-dimensional matrix of names of organisms versus their characters (each represented by a particular coded character state). Sometimes all character states (binary or multi-state) are treated as unordered. Molecular characters, for example, from the DNA sequences of genes can be coded as A, C, G, or T, representing the abbreviations of their individual (sequential) building blocks or subunits called nucleotides. A DNA sequence for a gene, for example, can be coded as a sequence of these letters representing its substituent nucleotides. Despite which type of characters is employed in uncovering evolutionary relationships of organisms, the shared derived character states (not the ancestral conditions prior to the changes) are used (whenever possible) to help define the lineages.
    In defining lineages on the basis of changes in shared characters from ancestral to more derived states, one qualification should at least be mentioned. If lineages are to be defined on the basis of shared changes, it is also important to note whether the change occurred at the beginning of a lineage or sometime after the lineage arose and only in a portion of its members. This is not always easy to determine (especially when the only living members possess the change that occurred after the lineage originated), but sometimes the characters of fossils can provide useful reference points. An ancestral condition refers to a feature or character of the ancestor of a group or it may be a homologous condition (related by descent) that existed prior to the origin of the group. The ancestral state of a particular character of a lineage is the state possessed by the ancestor of the lineage; it is, therefore, said to be ancestral to the lineage. Such a state may be modified (become a more derived state) later within a lineage. In this case, it is the ancestral state that applies to the entire lineage, because the modified state applies to a change that took place later in only a portion of the lineage. Consequently, the modified state can only be used to distinguish a portion of the lineage and does not apply to the entire lineage. This distinction is important, because apparently similar derived characters can arise multiple times within sometimes unrelated lineages. Therefore, it is often helpful to determine whether a derived character change has occurred at the very beginning of a lineage or somewhere within the lineage. This is why the characters of fossils are often important in understanding the lineages of modern organisms.
    By taking into consideration the above qualification, the following simple examples of the grouping of organisms on the basis of a few shared changes should shed a little more light on this subject. If aquatic (water inhabiting) relatives led to land inhabiting ones, the lineage of land plants can be defined by some shared unique character (e.g., the distinctive protected embryo), found in all land plants but not in the relatives of aquatic ancestors. The so-called "non-embryo producing plants" ("algae"), "non-vascular land plants" (living liverworts + mosses + hornworts without well developed vascular or water and food conducting tissue), "non-seed vascular plants" (any vascular plant with water and food conducting tissue and without seeds), and "non-flowering seed plants" (any seed plant without fruits) are defined by the absence of one or more changes; and, therefore, they may not be lineages, because they often represent mostly the ancestral condition before the changes took place. Plants in these often "non-lineage" groups (often considered as grades) will sometimes be featured together to help contrast the ancestral condition from the changes that took place in true lineages, but it is the lineages that help to accurately pinpoint the nature of a particular type of plant. Sometimes so-called non-group name can represent a lineage (e.g., living non-lycophyte vascular plants for the euphyllophytes), if this group can be defined by shared changes with a common ancestry. In this case, before lycophytes (today represented by club mosses, spike mosses, and quill worts) and euphyllophytes (today represented by ferns, horsetails, and seed and flowering plants) became separate sister lineages, the ancestor of both groups had dichotomous branching (branches successively forked in groups of two with no single main stem). This ancestral condition was retained in all of the earliest lycophytes (a group that was ancestrally with dichotomous branching) and was only modified later within this lineage. However, the earliest euphyllophytes already represented a change from dichotomous branching to overtopping (ancestrally with one long main stem and shorter side branches). In the ancestor of both lycophytes and euphyllophytes, the spore sacs were located at the tips of dichotomous branches. Although euphyllophytes did not have dichotomous branches (except those apical branchlets called terminal trusses), the earliest members of this group retained the ancestral terminal spore sacs (on the tips of the branchlets). This ancestral condition was only modified later within the lineage. However, the earliest lycophytes already represented a change from terminal spore sacs to lateral ones (those arising from the sides of branches). Therefore, the lineage of lycophytes can be characterized by lateral spore sacs, while the lineage of euphyllophytes are ancestrally distinguished by overtopping of branches. The definition of these two lineages is not based on the presence of the most primitive character states (e.g., dichotomous branching or terminal spore sacs). All presently living non-flowering seed plants and the flowering plants also appear (on the basis of DNA evidence) to be sister lineages. However, it is presently difficult to find a single, easily observable shared derived character state that distinguishes presently living non-flowering seed plants from all other lineages, including true flowering plants; and non-flowering seed plant fossils may eventually be identified that represent an ancestral line from which true flowering plants have originated.

    The lineages are often given special names to emphasize their importance (e.g., polysporangiophytes for those that first had dichotomous branching, representing a change from unbranched land plants with a single spore sac to branched plants with multiple spore sacs). The "unbranched land plants with a single spore sac" (representing the ancestral condition) is not a lineage, but those representing the change to branched plants with multiple spore sacs is a lineage that paved the way for new innovations in the major sublineages of vascular plants (those with well developed water and food conducting tissue, including lycophytes and euphyllophytes). Although the character "branched plants with multiple spore sacs" (apparently correlated with 'independence of sporophyte from gametophyte in early development') appears easy enough to observe and understand, this is actually a cryptic character, because there is presently no way of saying for sure whether the unbranced condition with a single spore sac directly led to the branched condition with multiple spore sacs. This is where not yet discovered fossil evidence could be helpful. Nevertheless, for the sake of keeping things (at least for now) as simple as possible, this distinction is provisionally made between the earliest land plants (today represented by liverworts, mosses, and hornworts) and the polysporangiophytes (today respresented only by the vascular plants). See qualifications on this broader lineage once referred to as polysporangiophytes. More will be said about this in the additional linked pages to the dictionary. Taxa (singular: taxum) are named taxonomic groups (= taxonomic units), often ranked as species, tribes, families, orders, classes, phyla or divisions. Often a plant or group of plants can be diagnosed or identified as a mixture of primitive (retained) characters (that have not changed) in addition to derived characters (that have changed) from the ancestral condition. Therefore, for the purposes of identification of plants or other organisms by using keys, a mixture of diagnostic primitive and derived characters can be employed. However, although not all traditional taxa are always true lineages, it is more and more recommended in modern taxonomy that all taxa should be strictly redefined according to shared derived (homologous) character states; and this can be done, as long as they represent true lineages, without always the need for a strict definition of rank or taxonomic (hierarchical) level. Furthermore, in the sometimes ranked classification systems based on lineages, a certain class may be the sister group to a higher ranking subdivision of other classes, but the first mentioned class may have no defined subdivision or the class itself may be considered the same as its subdivision. Therefore, in order to ensure that a plant gets placed in a lineage, it should always (irrespective of considerations of rank) be grouped with other plants only on the basis of shared derived (advanced) characters, never on the basis of the shared retained (primitive) characters, and ranking is only optional (not strictly enforced, according to the rules of traditional classification). One major reason why overall similarity methods often do not work very well is because these methods group plants on the basis of all shared characters [including not only derived (advanced) but also retained (primitive) ones]. The derivation of genealogical relationships (often simply called genealogy) within or between lineages is effectively done only by grouping plants on the basis of shared changes from related ancestral conditions. However, problems can also result from grouping on the basis of overall similarity of derived or divergent character changes, because the derived character changes may arise from different ancestral conditions (from different, unrelated origins). Each type of derived character change must represent homologous character states (that arise from a corresponding and related ancestral condition); and this type of derived character change must not be considered the same as one that only appears similar (a look-alike) but is the result of changes that are nonhomologous (from different unrelated ancestral conditions). If characters of shared changes from corresponding (related) ancestral conditions are easily recognized, these diagnostic characters can help in placing a plant in its appropriate lineage, and the identification of this plant becomes greatly simplified. The less reliable overall similarity methods are now called phenetic (or distance) methods, while the more reliable grouping of organisms based on shared changes from corresponding ancestral conditions is referred to as cladistic (or shared, derived character) methods. Of course, the responsibility of doing all this correctly or reliably is not completely left to the readers. They are introduced to diagnostic characters based on the labors and consensus of various authorities. Familiarity with often simple diagnostic characters of lineages (shared changes from corresponding ancestral conditions used to define lineages) becomes basic to proper plant identification. Therefore, before a bit more detail on the major lineages is introduced, the the reader is provided information on some of the basic defining features for the land plant groups, particularly the most common ones.

    In the past up to well into the 20th century, traditional botany (including taxonomic botany) dealt with additional life forms (e.g., algae, slime molds, fungi, lichens, and bacteria or certain other microscopic organisms) besides those with a land plant ancestry (= embryophytes) that are emphasized in this work. Although most of these additional organisms are now known to be distantly related to those most commonly referred to as "plants," their medicinal members will at times be included in this work to maintain the broad scope of traditional botany as once taught as a requirement for well trained apothecaries (early pharmacists) or physicians. Even medicinal organisms that are now known to be more closely related to animals (e.g., fungi) are sometimes included. There is even some mention of medicinal animals. Non-living, natural materials often considered minerals (such as medicinal lime or clay) are even occasionally listed in the main dictionary. Whenever known or felt appropriate, some chemistry of natural medicinal resources is featured in the paragraphs of the dictionary or linking pages. Although providing a traditional botany resource comparable to what was once available to well trained pharmacists or physicians, this work emphasizes a modern comparative method based on the genealogy (often supported by DNA) of living medicinal resources that does not completely overlook a possible correspondence of folk uses or medicinal properties with other characters or traits used in the classification and identification of these resources. Such an approach or perspective is discussed further below.

    A medicinal genus is defined here as a group of one or more very closely related species that are found to be medicinal any where in the world. If a medicinal genus is found in New Mexico, this will be noted, along with some of its local species and (if also present) local subspecies or varieties; and this will be done even when the local plants are not recorded to be used medicinally in the state. The same applies to medicinal species. When such entries occur, the reader will always be informed that the plants involved have likely medicinal properties, but no record of their use in New Mexico has yet been located. When two or more closely related species are found to be used for similar medicinal purposes in independent (widely separated) regions of the world or their uses correlate well with tested pharmacological activities or active chemicals (of at least one of the species), these uses (depending on how closely related the species) are considered statistically significant, not likely to occur by chance. The genus (or lower level), if it represents a well defined lineage, should be considered the most important category in taxonomy for the comparative study of statistically significant medicinal uses of closely related plants found anywhere in the world. Therefore, if a species of any of these genera (or lower levels) with statistically significant uses is known to be present in New Mexico, it will be listed in this dictionary, even though it is not known to be used medicinally in the state. Such statistically significant uses, especially those that pertain to plants at the level of the genus or below, can provide leads for the discovery (or re-discovery) of new (or forgotten) medicinal properties and also help to confirm the validity of known uses in New Mexico or elsewhere. See convergent uses, shared knowledge or convergence, and hypothesis for statistically significant uses.

    A taxon (plural: taxa) traditionally refers to a group of organisms at any rank (level in the taxonomic hierarchy, i.e., species, genus, family, order, etc.). Today, a taxon is ideally a group of organisms that is monophyletic.

    Contrary to what is often taught (as an ideal), there is not always just one preferred scientific name for the same species and their can be several alternative scientific names called synonyms that were often at one time or another considered preferred scientific names but have been rejected by a particular author or authors. The preferred name according to certain authors should also be distinguished from the correct name according to the ICBN Code. Sometimes the preferred name by most authors can be an incorrect name (a synonym) according to the ICBN. See example of this for the name Cardueae Cassini (= Thistle tribe) of the family Asteraceae. Recent DNA studies have lead to improvements in classifications that have resulted in multiple changes in names. Although often frustrating for people that do not want to have to keep up with the multitude of resulting new names, these improvements should not be considered a serious problem for those interested in names for real lineages (monophyletic groups) as opposed to artificial groups. However, when most revisions of the taxonomy have been regional rather than global, this can contribute to the confusion that has ensured the even more frustrating use of multiple taxonomic (scientific) names for the same species. See more on this problem and its attempted solution below.

    According to Judd, et al. (2007), a synonym is "one of two or more names applied to the same taxon." However, according to ICBN a synonym is a rejected name by a particular author or authors either because the name is illegitimate (violates one or more ICBN rules) or because of poor taxonomic judgement, representing a poorly circumscribed (artificial) group (Simpson, 2006). This is because according to ICBN, each taxon (with a relatively few allowed exceptions) can have only one correct name. Therefore, a synonym is officially considered an example of a rejected name rather than just an alternative name. Furthermore, it is a rejected name according to a particular author or authors. Which name is correct or which name is considered a synonym may depend on which authors of which references are consulted. It should also be pointed out to the reader that each taxon can bear only one correct name, except for certain cases specified through special actions of botanical congresses. Certain widely used names that are not actually the earliest published according to ICBN rules can be allowed through these special actions to be considered correct names in order to avoid unnecessary name changes. The eight families with the oldest names [Compositae (= Asteraceae), Cruciferae (= Brassicaceae), Gramineae (= Poaceae), Guttiferae (= Clusiaceae), Labiatae (= Lamiaceae), Leguminosae (Fabaceae s.l.), Palmae (= Arecaceae), and Umbelliferae (= Apiaceae)] and one subfamily [Papilionoideae (= Faboideae)] are allowed by ICBN to have two correct names.

    A correct name must (according to ICBN) be based on a type specimen, a pressed and dried plant mounted on a sheet of cardboard called a herbarium sheet deposited for reference in a herbarium (building where such specimens are kept safe and organized according to a classification system); or it can be an illustration of the plant. A type can, therefore, be an herbarium specimen or sometimes even an illustration chosen by taxonomists as being close or identical to that chosen by the original author as a designated representative of a plant name. All this goes back to the most important contributions of Linnaeus to botany, which were the establishment of a binomial system of naming, an herbarium to authenticate the system of naming, and the arrangment of the herbarium sheets (pressed, dried plant specimens usually glued to a white, light weight cardboard backing placed in an enclosing folder made from lighter weight paper) according to a hierarchical system of classification. Actually prior to Linnaeus, the origin of the what is today called the 'herbarium' (referred to by various other names before Tournefort) has been attributed to the great Italian botany teacher Luca Ghina; and probably first established (as a larger scale effort) by Ghina's student Cesalpino. Nevertheless, the influential Linnaeus stressed its importance in botany and the naming and classification of plants. The preservation of pressed and dried plant samples (specimens) indexed by some kind of system of names for future reference has become almost necessary for the preservation of traditional medicinal knowledge. The archiving (the filing away for future reference) of permanent plant collections as herbarium specimens kept protected and organized by a system of classification within an herbarium to back up the plant names changed botanical taxonomy from an inexact art to a more exact science, making possible for the first time worldwide standardization of only one name for each species represented by one or more plant specimens. Synonyms can be based on the same or different type specimens; and they may be based on the same or different type specimens than the correct names.

    In this work, the preferred or correct formal name is often immediately followed by a synonym in parentheses or brackets and the synonym is often preceded by an equal sign. Whenever a formal name is followed by a synonym in parentheses or brackets, there is also an attempt to clarify that the first name listed is the currently most accepted name. However, not all authors will always agree. In this work, sometimes a correct formal name is followed by a common name in parentheses or brackets and preceded by an equal sign or the order may be reversed. Two or more alternative common names are sometimes treated in a similar manner. If a genus name is the same as the common name, the genus name is often followed in parentheses by s.n. preceded by an equal sign. It is conventional for the synonym to be listed first followed by the correct formal name preceded by an equal sign. This convention is followed here only when the parentheses or brackets are not employed. In this case, a whole series of synonyms may be listed, each one separated by an equal sign; and the last name preceded by an equal sign is considered the correct name. In cases where a synonym is more commonly used than the correct name, the synonym is sometimes included first in the dictionary followed on the next line by the correct name preceded by an equal sign. This practice is applied to some recently changed names (e.g., the recent change of Acacia angustissima to Acaciella angustissima or Acacia greggii to Senegalia greggii).

    When a list of updated genera names for a particular region (such as Mexico) is provided, sometimes a few common names of some of the species of the genera often separated by commas are listed in parentheses after a genus name and the list of common names is preceded by e.g. followed by a comma. The abbreviation e.g. is short for the Latin phrase exempli gratia, which means for example. See such a listing of medicinal genera of Mexico in the plant family Asteraceae. This can be contrasted with the abbreviation i.e., which is short for the Latin id est, meaning in other words or that is.

    It is important to emphasize that an up-to-date, authoritative, synonymized check-list for a geographical region under consideration is a basic necessity for collating common names with scientific names of plants reported to be used medicinally from diverse and sometimes fragmented sources that are available from the literature. This is especially true if older literature sources are accessed. As a starting point for this dictionary, synonyms (alternative scientific names other than the correct names) are usually only included for plants found in New Mexico, according to the check-list Flora Neomexicana I by Kelly W. Allred (cited as NM). This is an annotated checklist for the names of vascular plants in the State, with synonyms and bibliography. When available for a region, such synonymized check-lists often provide a listing of the most important scientific name synonyms for each up-to-date preferred scientific name for species, subspecies, and varieties. Each preferred scientific name or synonym is often listed under the family name. In an attempt to ensure the most up-to-date preferred or correct names, other resources on the web have also been consulted, such as relatively recent sections of Flora of North America (cited as FNA), Biota of North America Program (cited as BONAP), and Families and Genera of Vascular Plants (cited as KEW).

    There is an effort by scientists to single out only one most up-to-date preferred or correct name for each species. However, when most revisions of the taxonomy of a genus, for example, have been regional rather than global, this can contribute to the confusion that has sometimes ensured the use of multiple taxonomic (scientific) names for the same species. Therefore, the need for a check-list of global scope has been stressed by the Global Strategy for Plant Conservation (UNEP). The Plant List ( is a attemped step toward an online flora of all known plants at the species level in the form of a global synonymized check-list.

    In this dictionary, even though focusing on specific regions (New Mexico and Morelos), an attempt is made to maintain a global perspective. Often plants are listed in this dictionary that grow wild in New Mexico that are considered important medicinal resources elsewhere in the world but little or no known reports may exist that indicate medicinal use of these resources in the State. For example, this appears to be the case in New Mexico for the genera Anaphalis, Gnaphalium, and Pseudognaphalium. Unfortunately, no information can yet be found that any of the species now assigned to Pseudognaphalium were ever actually used as medicinals by the Spanish New Mexicans. No reports could be found that Spanish New Mexican ever used any of the species of the above genera; and only two reports (see could be found that Native Americans in New Mexico have traditionally used certain species of Pseudognaphalium (i.e., P. canescens and P. stramineum) for some medicinal purpose. Nevertheless, if there is a high degree of consistency in the reports on use of closely related medicinal resources over a wide geographical area or especially in different (geogrphically independent) regions of the world, these are the reports on use emphasized and discussed in more detail in this work for plants growing wild in New Mexico, even when there are few or no reports for use of these plants in the State. It is emphasized in this work that closely related plants, even when present in different, sometimes geographically independent regions of the world, are often used for similar medicinal purposes; and these uses can sometimes even 'reflect' (or correlate with) the evolutionary relationships between the plants. In various regions occupied by people of a similar culture and the same language (e.g., Spanish), similar names are often given to closely related or sometimes more distantly related plants that can be used for similar medicinal purposes.

    In Spain, the name Gordolobo was first applied to Verbascum thapsus (= Punchon or Tobaco cimarron in New Mexico). Although this plant is unrelated to Anaphalis and some of the aromatic species of Antennaria, Gnaphalium, and Pseudognaphalium in the tribe Gnaphalieae (Cass.) Lecoq & Juillet of the family Asteraceae, the name Gordolobo Mejicano was applied by Francisco Hernandez in Mexico to certain plants of the genus Pseudognaphalium used by the Aztecs for some of the same purposes as the Spanish or Old World genus Verbascum. Species of these above genera of Gnaphalieae known to grow wild in New Mexico are reported in other parts of North America north of Mexico to have been smoked like a tobacco by people of various Native American tribe often for treatment of respiratory conditions, including allergic rhinitis (= hay fever), asthma, and dry cough or used as a smudge or fumigant. In southeastern North America north of Mexico, the common name Rabbit tobacco in English for species of the related genera Gnaphalium, Pseudognaphalium, and Gamochaeta "indirectly records the indigenous practice of mixing the leaves with tobacco (Nicotiana spp.) for smoking" (Austin, 2006). If according to this author "virtually all who live near" these plants have used them, why are there little or no reports on the their use in New Mexico? The species Anaphalis margaritacea is called Gordolobo in Baja California Sur; and people of recent Mexican descent in southern New Mexico and Arizona have used it as a brewed tea sweetened with honey for a raspy voice or sweetened with sugar for dry cough (Kay, 1996). Various species of the related genus Pseudognaphalium are commonly used for similar purposes right across the border by various indigenous people in Northern Mexico. One of these species Pseudognaphalium leucocephalum (Gray) A. Anderberg (= White rabbit-tobacco, also commonly called Everlasting, Gordolobo, Lemon cudweed, Lampaquate, or Manzanilla del rio) is also found in southwestern New Mexico. In this genus, the most common and widely distributed species Pseudognaphalium macounii (Greene) Kartesz (= Macoun's rabbit-tobacco) in New Mexico is also reported to be commonly used by indigenous people right across the border. From a global comparison of closely related plants, it has become apparent that knowledge of the uses of species of the genera Gnaphalium or Pseudognaphalium can be extended to the application of other closely related plants, such as Anaphalis and aromatic species of Antennaria for lung or respiratory conditions. Aside from related Native American uses of species of Antennaria in the prairies of the North American Great Plains, Antennaria neglecta Greene (= Field pussytoes) and Antennaria plantaginifolia (L.) Richards. (= Woman's tobacco) were highly valued by Eclectic doctors for chest complaints. Constantine Rafinesque wrote in the Medicinal Flora of the United States that these two species are "pectoral, used in coughs, fevers, bruises, inflammations, debility; ..." One plains tribe north of Mexico even used the dried powdered flowers of Anaphalis margaritacea as a strengthening medicine placed on the soles of horse's hoofs and blown between the horse's ears to make them long-winded, enduring, and spirited. This is mentioned because there have been reports that the flowering tops of Pseudognaphalium obtusifolium (Rabbit tobacco) of the eastern USA have been smoked or even inserted in pillows to ease the breathing of sleeping Anglos suffering from asthma. See also comparison of Anaphalis used by Native Americans with Pseudognaphalium used by Anglos in Indiana. Anaphalis margaritacea (L.) Benth. & Hook. f. (= Western pearlyeverlasting), which may be one of the first herbs from North America to have been cultivated in Europe, where it is now naturalized in Britain, was used for smoke therapies in Suffolk, Britain, where the leaves were smoked for treating coughs and headaches (Jobson, 1967). According to Gerarde (1633), the smoke and fumes of dried herbs were inhaled for coughs, for headaches, and for cleansing 'inward parts.'

  • Austin DF. (2006) Florida Ethnobotany, CRC Press, Boca Raton, London, New York, Washington, D.C.

    In this dictionary, there is an attempt to update the listing of family names for flowering plants on the basis of APG III (Angiosperm Phylogeny Group, 2009). This is based on the main principle of Backlund and Bremer (1998) that groups of organisms recognized by formal names should represent true (monophyletic) lineages. For each flowering plant family name, there is included, according to APG III (2009), the name of the order in which the family is a member. Family names for vascular plants together with names of some of their broader lineages are also featured according to Cantino, et al. (2007) and (for ferns and their relatives) Smith, et al. (2006). Therefore, some preferred family names may not always be the same as those listed for the genera, species, subspecies, or varieties in the consulted check-lists. Preferred family names are listed like other entries in alphabetical order of the first word in the paragraphs. When the family name of a consulted check-list is different from the preferred name listed, this is often noted in the paragraph including the preferred name. For more on the APG III system of family and order names, see below.

  • Backlund A, Bremer K. (1998) To be or not to be - principles of classification and monotypic plant families. Taxon 47: 391-401.
  • Haston E, Richardson JE, Stevens PF, Chase MW, Harris DJ. (2009) LAPG III: a linear sequence of the families in APG III. Botanical Journal of the Linnean Society 161: 128-131.

    Land plants are treated as a class Embryophyceae in the rank ordered classification [with kingdom Chlorobionta (= green plants)] of Lewis & McCourt (2004). However, according to the rules of ICBN, this is not a legitimate name, because it is not based on a taxonomic name. Neither is Embryophyta, but ranks are optional for lineage names [or if it is considered comparable to a kingdom, it does not need to be based on a taxonomic name and it can conventionally have various endings (suffixes)]. In an attempt to rank order flowering plants starting with green plants as the kingdom, APG III (2009) has proposed for all land plants the class Equisetopsida C.Agardh. This class name in other classifications [starting with land plants as the kingdom under the division (phylum) of vascular plants] has often been applied only to fossil and living relatives of the genus Equisetum (= Horsetails, e.g., Cola de caballo). More recently [Stevens, P.F. (2001 onwards)], the possible lineage including the orders Equisetales, Psilotales, and Ophioglossales of early branching "eusporangiate ferns" has been referred to by the name Equisetopsida C.Agardh. Using a large percentage of the gene makeup (genome) of chloroplasts, Lu, et al. (2015) and Grewe, et al. (2013) were able to resolve this possible lineage as sister to the lineage of marattioid ferns plus leptosporangiate ferns. In these studies, Equisetales appears as sister to Psilotales plus Ophioglossales and the possible lineage including these orders appears as sister to the order Marattiales plus leptosporangiate ferns. Despite their potentially confusing class name for land plants, the APG III (2009) system provides a working classification of class Equisetopsida (= embryophytes). They provide several informal names for various lineages (or clades) within the class for land plants, including monilophytes, gymnosperms, angiosperms, core angiosperms, magnoliids, monocots, commelinids, eudicots, core eudicots, rosids, fabids, malvids, asterids, lamiids, and campanulids. A few more informal lineage names and two grade names could be added to their classification, including land plants, "basal land plants" (grade), vascular plants, lycopsids, euphyllophytes, seed plants, "basal angiosperms" (grade), monocots + Ceratophyllum + eudicots, superrosids, and superasterids. If the APG III working classification becomes updated, it is likely that modifications or informal and more formal names will be added. The recently published APG IV (2016) provides evidence for additional lineages in angiosperms (e.g., superrosids and superasterids), but [other than the updated comments on genealogical relationships between and within orders and families by Stevens, P.F. (2001 onwards)] a new APG working classification for all living land plants is probably not yet available. See also land plant relationships, angiosperm relationships, eudicot tree, Rosidae tree, and Caryophyllales + asterids tree.

    The example below includes all entries (common and scientific names) found in the dictionary that apply to the genus Achillea L. (common name: yarrow) and its single New Mexican species. The dash symbol (-) acts as a delimiter used to place words or phrases in separate columns for a spread sheet. When importing the dictionary to a spread sheet or data base, use the dash symbol followed by the space bar to create the columns. Each entry is delimited by two end of line spaces and can be treated as a paragraph. Again (see above for more details), each entry (a scientific or common name, etc.) is in alphabetical order according to the first word in its paragraph. It should be noted that the L. following the genus name Achillea represents the abbreviation for the author of the genus name. This author happens to be Carl Linnaeus. Achillea millefolium L. is a common species in New Mexico. Several full scientific names called synonyms (including the authors of the names) are listed prior to some notes.
    Achillea millefolium
    Artemisa bastarda
    Camomila de los montes
    Carpenter's weed
    Ciento en rama
    Ciprés de invierno
    Ciprés de Judea
    Ciprés de perla
    Colchón de pobre
    Common yarrow
    Erva carpinteira
    Erva das cortadelas
    Erva de São João
    Erva do Bom Deus
    Erva dos carpinteiros
    Erva dos golpes
    Erva dos militares
    Erva dos soldados
    Flor de la pluma
    Flor de pluma
    Herva do carpintero
    Hierba carpintera
    Hierba de Aquiles
    Hierba de la cortadura
    Hierba de la muela
    Hierba de las cortaduras
    Hierba del carpintero
    Hierba del cortes
    Old man
    Pluma de la tierra
    Prazer das damas
    Real de oro
    Salvaçao do mundo
    Sereno de invierno
    Thousand seal
    Western yarrow
    Yarrow (common)


    All the genera of vascular plants in New Mexico will eventually be listed under the formal name of the family in which they belong. As an example for at least a partial list of genera in the family Asteraceae, a single asterisk is placed in front of the genus name, if one or more of its species are known (recorded) to be used medicinally anywhere in the world. A double asterisk indicates that one or more of the species of the genus are also considered medicinal in Morelos. This can be updated as additional information is found. It is hoped that eventually all the medicinal genera of the families of vascular plants will be provided with single or double asterisks. For each genera listed under a particular family, the common name of this genus given by BONAP or NM with a preceding equal sign is placed in parentheses following its formal name; and a common name that is the same as the formal one can be indicated by s.n. Another equal sign following the common name sometimes precedes a possible, alternative preferred name or synonym (according to some other modern authority, e.g., Mabberley, 1997). As the other names included in the dictionary, all family names are listed in alphabetical order. Those genera with one or two preceding asterisks (listed under the each family) are also placed in alphabetical order as separate entries in the dictionary. In other words, the formal names for each medicinal genus with a single or double asterisk listed under the family can also be looked up in alphabetical order in the dictionary. Under each of these entries for the genera can be found additional English, Spanish, Aztec or Mayan common names. All the species names in New Mexico are listed under the formal name for each medicinal genus. This listing of species names will eventually include single and double asterisks as in the listing of genera under the family. Each medicinal species can in turn be looked up under its formal name in alphabetical order to obtain additional English, Spanish, Aztec or Mayan common names. Under the formal name of each medicinal species is included (if present in New Mexico) formal subspecies or variety names. This is an attempt to maintain a systematic arrangement (a natural organization of scientific names as a nested hierarchy of lineages) and at the same time everything medicinal at the level of genus, species, variety, or subspecies (at least growing wild in New Mexico) can be conveniently looked up in alphabetical order. The order or higher level lineage name that each family belongs to can be found under the family name. Some of these higher level lineage names (including those applying to orders) have been published as formal names but others can pertain to informal names. Furthermore, some of the informal higher level lineage names listed under the formal family name in the dictionary may have been given published formal names. There is no attempt in the dictionary itself to list in alphabetical order any of these higher level lineage names above family. However, they can often be found listed at least for vascular plants in a systematic order or arrangement on a page dealing with higher level lineages to be eventually added. Some other published formal lineage names above or below the level of family can often be found elsewhere on some of the pages to be added. Eventually, the main dictionary will be linked to these additional pages. However, if all the possible names (formal or informal) for all the possible lineages and sublineages were actually listed in alphabetical order, the dictionary of names might become too voluminous for practical lookup of common and scientific names of medicinal organisms. Therefore, the dictionary itself lists in alphabetical order the formal names of medicinal organisms (at least those vascular plants known to grow wild in New Mexico) applying only to the levels of family, genus, species, and variety or subspecies. In turn, the common names are associated with the formal names applying to these levels. However, there is even an open question as to whether the listing of every possible Spanish or English common name for every medicinal in every local region of North America would prove practical, because a hard copy of such a dictionary might become too bulky for easy manual lookup. Where to draw the lines of limitations on all this is still open to several future considerations. Therefore, this dictionary is initially being constructed by focusing on only two states, New Mexico and Morelos. With the added pages, this work is likely to eventually at least serve as a comprehensive medicinal flora of New Mexico with information added especially for Morelos and sometimes for other regions in North America, especially the Southwest USA and adjacent Northern Mexico.

    The name of the family in which the genus Achillea is a member is included here (as an example) with (at least) the following information included:

    Asteraceae - Martynov - (APG III) Family Name
    (= Compositae Giseke)
    Asterales - Lindl. - (APG III) Order Name
    Higher level lineages:
    Angiospermae; Mesangiospermae;
    Eudicotyledoneae (= eudicots);
    Gunneridae (= core eudicots);
    Pentapetalae; Asteridae (= asterids);
    Gentianidae (= euasterids or core asterids);
    Campanulidae; Apiidae (= euasterid II = asterid II).
    Some of the highest level lineages:
    Embryophyta (Land Plant); Polysporangiophytes; Tracheophyta
    (eutracheophytes); Euphyllophyta; Spermatophyta (seed plants)
    In Morelos, a listing of 32 medicinal genera includes: - - (Atlas-Mexico)
    **Achillea L., Alomia Kunth, **Artemisia L., **Baccharis L.,
    Barkleyanthus H.Rob. & Brettell, **Bidens L., **Brickellia Elliott,
    Calea L., Calendula L., **Cirsium Mill., **Cosmos Cav.,
    **Dyssodia Cav., **Erigeron L., **Eupatorium L., **Gnaphalium L.,
    **Heterotheca Cass., Iostephane Benth., **Matricaria L.,
    Mikania Willd., Montanoa Cerv., **Pinaropappus Less.,
    Piqueria Cav., **Pluchea Cass., **Porophyllum Adans.,
    **Sanvitalia Lam., **Schkuhria Roth, Sclerocarpus Jacq., **Sonchus L.,
    **Tagetes L., **Tanacetum L., Tridax L., and **Verbesina L.
    **Genus found in New Mexico with one or more species reported
    to be considered medicinal in Morelos.
    In New Mexico, the Asteraceae is a well represented family - - (BONAP, NM)
    with the following 167 genera:
    **Achillea L. (= Yarrow), *Acourtia D. Don (= Desertpeony),
    Acroptilon Cass. (= s.n.), Adenophyllum Pers. (= Dogweed),
    *Ageratina Spach (= Snakeroot), *Ageratum L. (= s.n.),
    *Agoseris Raf. (= s.n.), Almutaster A.& D. Love (= ?) = Aster,
    *Ambrosia L. (= Ragweed), Amphiachyris (A. DC.) Nutt. (= s.n.),
    *Anaphalis DC. (= Pearlyeverlasting), *Antennaria Gaertn. (= Pussytoes),
    *Anthemis L. (= Chamomile),
    Antheropeas Rydb. (= Easterbonnets) = Eriophyllum Lagasca.,
    Aphanostephus DC. (= Dozedaisy), *Arctium L. (= Burrdock),
    *Arnica L. (= s.n.), **Artemisia L. (= Sagebrush),
    *Aster L. (= s.n.), **Baccharis L. (= s.n.),
    *Bahia Lag. (= s.n.), Baileya Harvey & Gray ex Gray (= s.n.),
    Bartlettia Gray (= s.n.), Bebbia Greene (= s.n.),
    *Berlandiera DC. (= s.n.), **Bidens L. (= Beggartick),
    Brachyactis Ledeb. (= Rayless aster), **Brickellia Ell. (= s.n.),
    Calycoseris Gray (= Tackstem), Calyptocarpus Less. (= s.n.),
    Carduus L. (= Plumeless thistle), Carminatia Moc. ex DC. (= s.n.),
    Carphochaete Gray (= Bristlehead), *Carthamus L. (= Distaff thistle),
    *Centaurea L. (= Star thistle), Chaenactis DC. (= s.n.),
    *Chaetopappa DC. (= Leastdaisy), Chamaechaenactis Rydb. (= s.n.),
    *Chaptalia Vent. (= Sunbonnetts), *Chloracantha Nesom (= s.n.),
    *Chrysactinia Gray (= s.n.), *Chrysothamnus Nutt. (= Rabbitbrush),
    *Cichorium L. (= Chicory), **Cirsium P. Mill. (= Thistle),
    *Conyza Less. (= Horseweed), *Coreopsis L. (= Tickseed),
    **Cosmos Cav. (= s.n.), *Crepis L. (= Hawksbeard),
    Dicoria Torr. ex Gray (= s.n.), Dicranocarpus Gray (= s.n.),
    Dracopis Cass. (= Coneflower), **Dyssodia Cav. (= s.n.),
    *Echinacea Moench (= Purple coneflower), *Eclipta L. (= s.n.),
    *Encelia Adans. (= Brittlebush), Engelmannia Gray ex Nutt. (= s.n.),
    *Ericameria Nutt. (= Heathgoldenrod), **Erigeron L. (= Fleabane),
    *Eupatorium L. (= Thoroughwort), Euthamia Nutt. ex Cass. (= Goldentop),
    Evax Gaertn. (= Pygmy cudweed) = Filago, Filago L. (= Cottonrose),
    Flaveria Juss. (Yellowtops), Flourensia DC. (Tarwort),
    *Gaillardia Foug. (= s.n.), Galinsoga Ruiz & Pavon (= s.n.),
    **Gnaphalium L. (= Cudweed), *Grindelia Willd. (= Gumweed),
    *Gutierrezia Lag. (= Snakeweed), Gymnosperma Less. (= s.n.),
    Haploesthes Gray (Falsebroomweed), *Helenium L. (= Sneezeweed),
    Helianthella Torr. & Gray (= s.n.), *Helianthus L. (= Sunflower),
    Heliopsis Pers. (= s.n.), Heliomeris Nutt. (= s.n.),
    Herrickia Woot. & Standl. (= s.n.) = Aster, Heterosperma Cav. (= s.n.),
    **Heterotheca Cass. (= Telegraphplant), *Hieracium L. (= Hawkweed),
    *Hymenoclea Torr. & Gray ex Gray (= Burrobush),
    *Hymenopappus L'Her. (= s.n.), Hymenothrix Gray (= s.n.),
    *Hymenoxys Cass. (= s.n.), *Hypochaeris L. (= Catsear),
    Ionactis Greene (= s.n.), *Isocoma Nutt. (= s.n.), *Iva L. (= s.n.),
    Jefea Stother (= s.n.), Krigia Schreb. (= s.n.),
    *Lactuca L. (= Lettuce), Laennecia Cass. (= s.n.),
    Lasianthaea DC. (= s.n.), Lasthenia Cass. (= s.n.),
    Layia Hook. & Arn. ex DC. (= Tidytips), Leibnitzia Cass. (= s.n.),
    Lepidospartum (Gray) Gray (= Broomsage),
    *Leucanthemum P. Mill. (= s.n.),
    *Liatris Gaertn. ex Schreb. (= Gayfeather),
    *Lygodesmia D. Don (= Skeletonplant),
    *Machaeranthera Nees (= s.n.), *Madia Molina (= Tarweed),
    *Malacothrix DC. (= s.n.), **Matricaria L. (= Mayweed),
    Melampodium L. (= s.n.), Nicolletia Gray (= s.n.),
    Nothocalais (Gray) Greene (= s.n.), Oligoneuron Small (= ?),
    *Onopordum L. (= Cottonthistle), Palafoxia Lag. (= s.n.),
    Parthenice Gray (= s.n.), *Parthenium L. (= Feverfew),
    *Pectis L. (= Fetid marigold), *Pentzia Thunb. (= s.n.),
    *Pericome Gray (= s.n.), Perityle Benth. (= Rockdaisy),
    *Petradoria Greene (= Rockgoldenrod),
    *Picradeniopsis Rydb. ex Britt. (= Bahia) = Bahia,
    **Pinaropappus Less. (= Rocklettuce), Platyschkuhria Rydb. (= s.n.),
    **Pluchea Cass. (= s.n.), **Porophyllum Adans. (= s.n.),
    Prenanthella Rydb. (= s.n.), *Psacalium Cass (= s.n.),
    *Psathyrotes Gray (= s.n.), Pseudoclappia Rydb. (= s.n.),
    *Pseudognaphalium Kirp. (= ?), Psilactis Gray (= ?),
    *Psilostrophe DC. (= Paperflower), *Pyrrhopappus DC. (= Desertchicory),
    Pyrrocoma Hook. (= s.n.), Rafinesquia Nutt. (= California chicory),
    *Ratibida Raf. (= Prairie coneflower), *Rudbeckia L. (= Coneflower),
    **Sanvitalia Lam. (= s.n.), Sartwellia Gray (= s.n.),
    **Schkuhria Roth (= False threadleaf), Scorzonera L. (= s.n.),
    *Senecio L. (= Groundsel), *Silphium L. (= Rosinweed),
    *Silybum Adans. (= Milkthistle), Simsia Pers. (= Bushsunflower),
    *Solidago L. (= Goldenrod), **Sonchus L. (= Sowthistle),
    *Stenotus Nutt. (= s.n.), *Stephanomeria Nutt. (= Wirelettuce),
    *Stevia Cav. (= Candyleaf), Stylocline Nutt. (= s.n.),
    **Tagetes L. (= Marigold), **Tanacetum L. (= Tansy),
    *Taraxacum G.H. Weber ex Wiggers (= Dandelion),
    *Tetraneuris Greene (= Hymenoxys), *Tetradymia DC. (= Horsebrush),
    *Thelesperma Less. (= Greenthread), *Thymophylla Lag. (= s.n.),
    Tonestus A. Nels. (= s.n.), *Townsendia Hook. (= s.n.),
    *Tragopogon L. (= Goatsbeard), *Trixis P. Br. (= s.n.),
    Uropappus Nutt. (= ?), **Verbesina L. (= Crownbeard),
    *Vernonia Schreb. (= Ironweed), Viguiera Kunth (= Goldeneye),
    *Wyethia Nutt. (= s.n.), *Xanthisma DC. (= Xanthium),
    *Xanthium L. (= Cocklebur), and *Zinnia L. (= s.n.).
    *Genus found in New Mexico with one or more species reported
    to be used medicinally somewhere in the world.
    **Genus found in New Mexico with one or more species reported
    to be considered medicinal in Morelos.
    See notes.

    The main Spanish/English/scientific names dictionary will eventually be supported by links to other pages. These include pages on botany, medicinal properties, and even plant fossils that are not organized by the alphabetical order of any system of names, but (as much as possible) according to the order of branching of lineages. However, there are two glossaries, including subject names and botanical terms useful in identification that are placed in alphabetical order. The information on fossils is provided to help support lineages, genealogical relationships (branching pattern of ancestor-descendant relationships due to evolution), or even locate uncertain evolutionary relationships on the tree of life. An attempt is made to extensively interlink all pages with each other. The pages organized on the basis of genealogical relationships aid the reader in developing a better understanding of the distribution of medicinal properties in various lineages. An attempt is made here to address all the issues involved in the study of living medicinal remedies by integrating as much as possible the classification and identification (involving what is called systematic biology or botany) with the properties and uses of these natural resources.

    The organization of nature does not center around human beings and their needs. Our uses of living medicinal resources depend on our ability to find an application for properties provided within the framework of the natural order. In this way our uses of living medicinal resources depend and often can even reflect the natural order referred to here as genealogical relationships, which influence and are influenced by ecological relationships between living organisms and the environment. Once it can be recognized that medicinal properties of plants or other organisms tend to be organized in nature according to genealogical relationships of these resources, the more natural genealogical perspective can be used as a complementary but alternative approach to lists of remedies artificially organized in alphabetical order or on the basis of how they can be employed to treat health conditions pertaining to the systems of the human body. This genealogical approach is necessary in developing a general "birds-eye view" of the medicinal resource potential of larger and larger numbers of living resources used by people throughout the world. This systematic arrangement allows for the possibility of showing that a significant percentage of medicinal information can fall together on the basis of major lineages and sublineages of the living resources, which can enable more efficient storage and retrieval of specific information at the same time as providing a broader perspective that can often help the reader remember or keep track of the major properties of a wider diversity of living medicinal resources. On the other hand, this broad perspective can be employed to help the reader narrow down and understand the properties of specific medicinal resources in the regions of interest, namely the Southwest USA, focusing on New Mexico, and the often much more diverse regions of Mexico, focusing on Morelos. The genealogical perspective offered here can even aid the herbalist that wants to adopt only a small collection of highly effective medicinal resources, because such a reader can be selective in excessing the links of these pages that address information on his or her choice medicinal plants to learn how to identify these remedies and distinguish them from others in the same or different lineages. When searching for alternative remedies with similar medicinal properties, such remedies are often concentrated in specific (relatively narrow) lineages; however, due to independent development of similar properties, alternatives can also be found in different lineages. The search for an alternative remedy to one that may not grow in the region of the herbalist can be greatly aided by this genealogical perspective. If a species of interest does not grow in a particular region but other members of the specific lineage of this species can be found, the herbalist can make an attempt to selectively uncover traditional use information for these alternative species. Potential alternative species that grow wild in New Mexico for genera will often be listed in the main Spanish/English/scientific names dictionary. Uncovered traditional use information for any of these species can often aid (as statistical confirmation) in selecting the ones most likely valuable as alternatives. If no members of a specific lineage can be found growing wild in the region, the quest for a local alternative becomes more difficult, but more inclusive lineages or different lineages can be searched for one or more species with the sought-after properties or traditional use patterns. The genealogical perspective can often provide a well-defined frame of reference for such a search. The genealogical perspective also provide the most efficient means for organizing information that can aid in the classification and identification of organisms of medicinal interest. Without this perspective the learning process often becomes the memorization of artificially organized information that is not always easily assimilated. Without any understanding of how to recognize the diagnostic characters that aid in the identification of medicinal resources and how major medicinal properties often can be associated with specific lineages, the reader is left with lists of medicinal resources that he or she cannot easily identify in the wild. Many species in these lists may not even grow wild in the region where the reader resides.

    Much could be written about the medicinal uses of plants or other organisms listed in this dictionary. Although such information on uses is often fascinating, the primary purpose of this dictionary is not the enumeration of all recorded medicinal folk lore but to provide a means for collating medicinal resource names upon the basis of a strong emphasis on genealogy of plants and other living medicinal resources. This is the perspective that becomes most useful to accurate identification of the medicinal organisms. Without accurate identification, the names by themselves become meaningless. Because land plants (especially vascular and seed plants) are the most common living medicinal resources, much effort has been made to backup the multitude of names with a basic botany resource (to eventually be linked to the dictionary) that can help the reader develop practical skills in the identification of these most common plant resources. One of the more effective ways of doing this in most cases is to become familiar with the diagnostic features of the major lineages of the medicinal plant tree of life. Although the listing of all recorded medicinal folk uses is beyond the scope of this dictionary, some uses (with an emphasis on statistically significant ones, when known) will here and there be incorporated in the pages on botany, especially when they help reveal underlying medicinal properties or correlate well with the distribution of pharmacologically active chemicals in families or other plant groups. This is done, because such a distribution of chemicals and their medicinal properties are often closely linked to the genealogy of living organisms, and, therefore, can be incorporated (along with other characters of form and structure) in classification and identification. In this work, there is much effort to characterize the distribution of specific types of chemicals of medical interest in various plant lineages. The reader can find much information on the distribution of tannins, lignans, neolignans, terpenes, phenolics, flavonoids, alkaloids, etc. in the very lineages that he or she is learning to identify. Since information for plant identification is linked to all the included scientific names; and all the located common names are linked to all these scientific names, this dictionary can become much more than a list of names and should be most useful to the practical herbalist, as well as anyone interested in learning more about medicinal plants.

    Information and names for medicinal resources from local Native American tribes in the United States and Mexico that are not meant to be shared with outsiders are largely omitted. Only those tribal plant names (with the exception of some in the Mayan and Nahuatl languages) that have largely been adopted by outsiders are included. For example, the New Mexican name "Osha" for the species Ligusticum porteri might have been derived from a Tewa Pueblo name. Unrecorded information on tribal uses of plants or other medicinal resources are largely omitted. Only those tribal uses that are widely known are sometimes included, but even in this case, details on already recorded tribal medicinal resources and their uses in ritual, ceremony, or other matters held sacred to Native Americans are omitted. However, some recorded sacred knowledge from the Old World ancestors of Spanish and other European descendants presently living in the New World will often appear remarkably similar to some of the reported sacred knowledge of Native Americans. The same appears to be true for other peoples, because closely related plants all over the world can often be used for similar purposes; and the body, soul, and spirit are commonly treated as one in traditional medicine. Therefore, certain commonalities found in certain regions all over the world that relate to uses of closely related plants in the United States and Mexico will often be singled out. Examples are the remarkably similar ritual or ceremonial uses presently or in the past of juniper, species of Artemisia, and sweat grass by peoples in both the Old and New World. More generally, the medicinal knowledge of ancient historical cultures of India, Babylonia, Assyria, Sumer or Egypt (like many Native cultures in the Americas), was considered sacred, often said to have been derived from Deities, who were recorded to have instructed men or women on the healing properties of plants. The sacred connection of medicinal herbs with the Deities is without doubt prehistoric and may extend far back in time to periods when certain people today widely separated (geographically or culturally) once lived in close contact and could have exchanged many ideas. For example, it could be speculated that this may be true for the connection with a Mother Deity of the plant genus Artemisia. Aside from mention of some remarkable similarities in use of closely related plants by (once or until 1492) widely separated peoples, the listing of all possible medicinal uses is again beyond the scope of this dictionary. Some records on plants or other organisms not known to be used for any other purpose except in certain Native American tribal ceremonies may be briefly mentioned only to make the listing of potential medicinal resources as complete as possible, but details on the uses of such resources and the ceremonies or rituals are excluded. In the commentary pages that will eventually be linked to the dictionary, there will be more of an emphasis on similarities of active chemicals and properties of known and unknown chemistry based on how closely related the living medicinal resources are to each other. Medicinal folk uses that are said to be convergent or correlate well with pharmacology of active chemicals (well defined medicinal properties) are also emphasized in the work.

    The reasons that an accurate correspondence of names with preserved plant samples is an important step in the preservation of traditional medicinal knowledge can never be stressed enough in any written work dealing with plant names. Even much of the unrecorded, sacred medicinal knowledge of Native Americans not meant to be shared with outsiders can and should be preserved for future generations within these tribes by learning some lessions from the European history of botany. For example, before the herbarium (see contributions of Ghina, Cesalpino, and Tournefort, re-emphasized by the great influence of Linnaeus) or the preservation of pressed and dried plant samples (specimens) indexed by some kind of system of names for future reference, confusions in plant identification and even the retention of traditional medicinal knowledge became a serious problem in Europe. This became even more serious as the number of known plants began to rapidly increase by near the end of 15th and beginning of the 16th century with the European "discovery" of the New World. Although a list of plant names without some kind of link to proper identification is next to useless, preserved plant samples accurately labeled by names can help provide such a link, which can also at least provide [by acting as vouchers (plant frames of reference)] an almost necessary means of entry for the preservation of traditional medicinal knowledge. For tribal peoples that are concerned about keeping their knowledge of the uses of medicinal plants from outsiders (or unauthorized/uninitiated tribal members) but that are losing many of their traditions, the preservation of pressed and dried medicinal plant specimens indexed by some kind of system of names (perhaps, only labeled with transcribed tribal plant names in addition to the more universal scientific names) for future reference would at least help solve many problems in proper plant identification, which usually become more severe as this knowledge begins to become less common. These plant samples could be used solely by authorized tribal members for reference in passing the private, unrecorded oral traditions about medicinal uses to future generations of their healers. This is why a work like this can provide important insights on preservation of traditional medicinal knowledge for people other than the outsiders without directly exposing that which is private to them.

    Also, knowledge presented in this work for similar medicinal properties and uses of closely related plants by the "five figures" humans (here and there) all over the world (especially in relatively independent geographical regions) should not be considered a threat to the privacy of more local tribal medicinal knowledge, but it should rather be considered re-inforcement to help preserve this more local knowledge. Even those medicinal plants found only in one restricted area may sometimes have relatively close relatives with similar properties and uses found elsewhere in the world.

    The distribution of the natural chemicals called flavonoids and tannins in various land plant groups is perhaps one of the simplest examples of how the occurrence of naturally derived chemical compounds (more specifically called secondary chemicals), some of which contribute to medicinal properties, can correspond to the broad genealogical relationships of botanical resources. More info on this distribution of flavonoids (with some common structural formulas) and tannins is covered in the subject glossary for phenolic compounds in land plants. Medicinal properties and even uses can potentially be associated with the distribution (when known) of certain chemical structures. Eventually, students of medicinal plants may begin to appreciate important correspondences between similarities in human herbal use (especially in widely separated regions of the world) and various branching arrangements on the plant tree of life. This will become more evident especially if as many uses as possible are collectively taken into consideration (as was once done by Dioscorides in the 1st century A.D.). He grouped or classified medicinals often on the basis of as many properties associated with folk use as possible. Although the original classification system of Dioscorides may now be considered by modern standards crude or rudimentary, it was devised according to this author to make memorization of larger numbers of natural remedies and their properties easier, foreshadowing by almost 1900 years the use of systematic arrangement of medicinal plants in pharmacognosy for the same purpose. However, the more modern approach (at least consistent with the objectives of traditional medicinal botany) would be to show how much a multitude of medicinal uses (worldwide), together with corresponding chemical and pharmacological properties can sometimes collectively relate to the well supported genealogy of plants. This could provide the student of botany with a way of simplifying the learning and identification of a multitude of medicinal plants by providing a classification system that groups these organisms on the basis of how the majority of medicinal properties or other diagnostic features most consistently fit together. As a possible subdivision of the field called ethnopharmacology (or related fields called ethnobotany or ethnobiology), I call this approach comparative ethnopharmacology, which uses modern methods of phylogenetic systematics to compare living medicinal resources in order to uncover the extent to which medicinal properties (including folk uses) collectively "fit together" according to resource genealogy. This method is only summarized in the appendix provided here. Although a detailed study of the method of comparative ethnopharmacology is beyond the scope of this dictionary, the pages that will eventually be linked discuss medicinal properties (including folk uses), as well as the naming, describing, identifying, and classifying of living medicinal resources, on the basis of genealogy. Therefore, the linked pages attempt to compare the different lineages of medicinals and their properties and uses on the basis of resource genealogy. This can be referred to as a type of genealogical focusing. The dictionary itself is an attempt to collate as much as possible medicinal plant names in relationship to a basic understanding of plant genealogy. Furthermore, similarities and differences in the multitude of medicinal uses can probably be best appreciated with the aid of a broad understanding of genealogy (= genealogical relationships = evolutionary relationships). From the perspective of comparative ethnopharmacology (an approach that may someday become more widely appreciated) and on the basis of genealogy, the classification, identification, and the act of uncovering medically interesting and even useful properties in plants or other organisms can again (as in the traditional medicinal botany of the past) become overlapping and mutually supportive processes. Therefore, it is from this perspective that botany of medicinal resources can most usefully be introduced to the traditional healer or herbalist. This approach is also more consistent with the origins of botany as a science, which was traditionally developed primarily for the needs of the healer, physician, or pharmacist.

    The student of herbs should also be at least aware of other related fields, such as biochemistry, biology and botany, chemical ecology, comparative biology, comparative phytochemistry, ecology, ethnobotany and ethnobiology, ethnopharmacology, genetics, paleobotany, pharmacognosy, pharmacology, pharmacophylogeny, phylogenetic systematics, systematics and taxonomy, and zoopharmacognosy.

    Basic to description, identification, nomenclature (naming), and classification (= systematic arrangement) of medicinal plants is an understanding of plant characters or traits. See plant characters, heritable polymorphic traits, evolution of genuine characters, genuine characters and their states, nonheritable traits, molecular characters, morphological characters from fossils, bioactive chemical characters and plant genealogy, difficult character definition, cryptic characters (example), reversals, parallelisms and convergences, and shared divergent characters.

    Table 1. A listing of important family names (in alphabetical order) are as follows:
    Acanthaceae, Acoraceae, Adoxaceae, Agavaceae, Alliaceae, Altingiaceae, Amaranthaceae, Anacardiaceae, Annonaceae, Apiaceae, Apocynaceae, Araceae, Arecaceae, Aristolochiaceae, Asphodelaceae, Asteraceae, Begoniaceae, Betulaceae, Bignoniaceae, Boraginaceae, Brassicaceae, Burseraceae, Cactaceae, Cannabaceae, Caprifoliaceae, Caricaceae, Cistaceae, Commelinaceae, Convolvulaceae, Crassulaceae, Cucurbitaceae, Cupressaceae, Dennstaedtiaceae, Dryopteridaceae, Ebenaceae, Equisetaceae, Ericaceae, Euphorbiaceae, Fabaceae, Fagaceae, Gentianaceae, Geraniaceae, Krameriaceae, Lamiaceae, Lauraceae, Loranthaceae, Lythraceae, Malpighiaceae, Malvaceae, Meliaceae, Moraceae, Myrtaceae, Nyctaginaceae, Oleaceae, Onagraceae, Orobanchaceae, Papaveraceae, Phytolaccaceae, Pinaceae, Piperaceae, Plantaginaceae, Plumbaginaceae, Poaceae, Polygalaceae, Polygonaceae, Polypodiaceae, Portulacaceae, Primulaceae, Pteridaceae, Ranunculaceae, Rosaceae, Rubiaceae, Rutaceae, Santalaceae, Sapindaceae, Sapotaceae, Schisandraceae, Scrophulariaceae, Selaginellaceae, Simaroubaceae, Smilacaceae, Solanaceae, Theaceae, Tropaeolaceae, Turneraceae, Urticaceae, Valerianaceae, Verbenaceae, Violaceae, Vitaceae, and Zygophyllaceae.
    These family names are also included in the main list--with author(s) and classification system based on DNA, including orders and higher level lineages.
    The families can be grouped into orders. The order name is a single word ending in the suffix -ales. Finally, the orders can be grouped into a series of lineages with the more inclusive lineages listed before the less inclusive ones. The genera and species composition of the families, orders, and other lineages listed in this dictionary have been largely supported by DNA evidence.

    Table 2. Key Medicinal Genera of Morelos, Mexico* [numbered in alphabetical order (with family in brackets)]:
    Do search on medicinal plants of Mexico; medicinal plants of Morelos.
    1. Acacia - P. Mill. - [Fabaceae],
    2. Acalypha - L. - [Euphorbiaceae],
    3. Achillea - L. - [Asteraceae],
    4. Agastache - Gronov. - [Lamiaceae],
    5. Agave - L. - [Agavaceae],
    6. Alchemilla - L. - [Rosaceae],
    7. Allium - L. - [Alliaceae],
    8. Aloe - L. - [Aloaceae (= Asphodelaceae)],
    9. Alomia - Kunth - [Asteraceae],
    10. Aloysia - Juss. - [Verbenaceae],
    11. Ampelopsis - Michx. - [Vitaceae (= Vitidaceae)],
    12. Amphipterygium - Schiede ex Standl.
    = Juliania - Schltdl.(SUH) - [Anacardiaceae (Julianaceae)],
    13. Anagallis - L. - [Primulaceae],
    14. Annona - L. - [Annonaceae],
    15. Anoda - Cav. - [Malvaceae],
    16. Apium - L. - [Apiaceae],
    17. Arachis - L. - [Fabaceae],
    18. Arctostaphylos - Adans. - [Ericaceae],
    19. Argemone - L. - [Papaveraceae],
    20. Aristolochia - L. - [Aristolochiaceae],
    21. Artemisia - L. - [Asteraceae],
    22. Arundo - L. - [Poaceae],
    23. Asclepias - L. - [Asclepiadaceae (now placed within Apocynaceae)],
    24. Baccharis - L. - [Asteraceae],
    25. Bacopa - Aubl. - [Scrophulariaceae (now placed in Plantaginaceae)],
    26. Barkleyanthus - H.Rob. & Brettell - [Asteraceae],
    27. Begonia - L. - [Begoniaceae],
    28. Bidens - L. - [Asteraceae],
    29. Bocconia - L. - [Papaveraceae],
    30. Boerhavia - L. - [Nyctaginaceae],
    31. Borago - L. - [Boraginaceae],
    32. Borreria - G.Mey. = Spermacoce - L. - [Rubiaceae],
    33. Bougainvillea - Comm. ex Juss. - [Nyctaginaceae],
    34. Bouvardia - Salisb. - [Rubiaceae],
    35. Brassica - L. - [Brassicaceae],
    36. Brickellia - Elliott - [Asteraceae],
    37. Brugmansia - Pers. - [Solanaceae],
    38. Buddleja - L. - [Buddlejaceae (now placed in Scrophulariaceae)],
    39. Bunchosia - Rich. ex Kunth - [Malpighiaceae],
    40. Bursera - Jacq. ex L. - [Burseraceae],
    41. Byrsonima - Rich. ex Kunth - [Malpighiaceae],
    42. Caesalpinia - L. - [Fabaceae],
    43. Calea - L. - [Asteraceae],
    44. Calendula - L. - [Asteraceae],
    45. Calliandra - Benth. - [Fabaceae],
    46. Cannabis - L. - [Cannabaceae (Cannabidaceae)],
    47. Capsicum - L. - [Solanaceae],
    48. Carica - L. - [Caricaceae],
    49. Casimiroa - La Llave - [Rutaceae],
    50. Cassia - L. - [Fabaceae],
    51. Castilleja - Mutis ex L.f. - [Scrophulariaceae (now placed in Orobanchaceae)],
    52. Cedrela - P.Browne - [Meliaceae],
    53. Cestrum - L. - [Solanaceae],
    54. Cinnamomum - Schaeff. - [Lauraceae],
    55. Cirsium - Mill. - [Asteraceae],
    56. Cissus - L. - [Vitaceae (= Vitidaceae)],
    57. Citrus - L. - [Rutaceae],
    58. Clematis - L. - [Ranunculaceae],
    59. Cocos - L. - [Arecaceae],
    60. Coffea - L. - [Rubiaceae],
    61. Commelina - L. - [Commelinaceae],
    62. Cordia - L. - [Boraginaceae (Ehretiaceae)],
    63. Cosmos - Cav. - [Asteraceae],
    64. Crataegus - L. - [Rosaceae],
    65. Crescentia - L. - [Bignoniaceae],
    66. Crotalaria - L. - [Fabaceae],
    67. Croton - L. - [Euphorbiaceae],
    68. Cucurbita - L. - [Cucurbitaceae],
    69. Cunila - Royen ex L. - [Lamiaceae],
    70. Cuphea - P.Browne - [Lythraceae],
    71. Cupressus - L. - [Cupressaceae],
    72. Cydonia - Mill. - [Rosaceae],
    73. Cynodon - Rich. - [Poaceae],
    74. Datura - L. - [Solanaceae],
    75. Didymaea - Hook.f. - [Rubiaceae],
    76. Diospyros - L. - [Ebenaceae],
    77. Dodonaea - Mill. - [Sapindaceae],
    78. Dorstenia - L. - [Moraceae],
    79. Dryopteris - Adans. - [Dryopteridaceae],
    80. Dyssodia - Cav. - [Asteraceae],
    81. Equisetum - L. - [Equisetaceae],
    82. Erigeron - L. - [Asteraceae],
    83. Eriosema - (DC.) Rchb. - [Fabaceae],
    84. Erythrina - L. - [Fabaceae],
    85. Eucalyptus - L'Her. - [Myrtaceae],
    86. Eugenia - L. - [Myrtaceae],
    87. Eupatorium - L. - [Asteraceae],
    88. Euphorbia - L. - [Euphorbiaceae],
    89. Eysenhardtia - Kunth - [Fabaceae],
    90. Ficus - L. - [Moraceae],
    91. Foeniculum - Mill. - [Apiaceae],
    92. Fraxinus - L. - [Oleaceae],
    93. Galphimia - Cav. - [Malpighiaceae],
    94. Gentiana - L. - [Gentianaceae],
    95. Geranium - L. - [Geraniaceae],
    96. Gliricidia - Kunth - [Fabaceae],
    97. Gnaphalium - L. - [Asteraceae],
    98. Guazuma - Mill. - [Sterculiaceae (now placed in Malvaceae)],
    99. Haematoxylum - L. - [Fabaceae],
    100. Hedeoma - Pers. - [Lamiaceae],
    101. Heimia - Link - [Lythraceae],
    102. Helianthemum - Mill. - [Cistaceae],
    103. Heterotheca - Cass. - [Asteraceae],
    104. Hura - L. - [Euphorbiaceae],
    105. Hyptis - Jacq. - [Lamiaceae],
    106. Illicium - L. - [Illiciaceae (now placed in Schisandraceae)],
    107. Iostephane - Benth. - [Asteraceae],
    108. Ipomoea - L. - [Convolvulaceae],
    109. Iresine - P.Browne - [Amaranthaceae],
    110. Jatropha - L. - [Euphorbiaceae],
    111. Justicia - L. - [Acanthaceae],
    112. Krameria - L. ex Loefl. - [Krameriaceae],
    113. Lantana - L. - [Verbenaceae],
    114. Larrea - Cav. - [Zygophyllaceae],
    115. Leonotis - (Pers.) R.Br. - [Lamiaceae],
    116. Lepechinia - Willd. - [Lamiaceae],
    117. Lepidium - L. - [Brassicaceae],
    118. Leucaena - Benth. - [Fabaceae],
    119. Lippia - L. - [Verbenaceae],
    120. Liquidambar - L. - [Hamamelidaceae (now placed in Altingiaceae)],
    121. Litsea - Lam. - [Lauraceae],
    122. Lopezia - Cav. - [Onagraceae],
    123. Lysiloma - Benth. - [Fabaceae],
    124. Malpighia - L. - [Malpighiaceae],
    125. Malva - L. - [Malvaceae],
    126. Malvaviscus - Fabr. - [Malvaceae],
    127. Mangifera - L. - [Anacardiaceae],
    128. Marrubium - L. - [Lamiaceae],
    129. Matricaria - L. - [Asteraceae],
    130. Medicago - L. - [Fabaceae],
    131. Melia - L. - [Meliaceae],
    132. Mentha - L. - [Lamiaceae],
    133. Mikania - Willd. - [Asteraceae],
    134. Mimosa - L. - [Fabaceae],
    135. Mirabilis - L. - [Nyctaginaceae],
    136. Montanoa - Cerv. - [Asteraceae],
    137. Murraya - L. - [Rutaceae],
    138. Nerium - L. - [Apocynaceae],
    139. Nicotiana - L. - [Solanaceae],
    140. Ocimum - L. - [Lamiaceae],
    141. Oenothera - L. - [Onagraceae],
    142. Origanum - L. - [Lamiaceae],
    143. Oryza - L. - [Poaceae],
    144. Pachyrhizus - Rich. ex DC. - [Fabaceae],
    145. Parmentiera - DC. - [Bignoniaceae],
    146. Pedilanthus - Neck. ex Poit. - [Euphorbiaceae],
    147. Pelargonium - L'Her. ex Aiton - [Geraniaceae],
    148. Penstemon - Schmidel - [Scrophulariaceae (now placed in Plantaginaceae)],
    149. Peomus - ? - [?],
    150. Persea - Mill. - [Lauraceae],
    151. Petiveria - L. - [Petiveriaceae = Phytolaccoideae/Rivinoideae of Phytolaccaceae],
    152. Petroselinum - Hill - [Apiaceae],
    153. Phlebodium - (R.Br.) J.Sm. - [Polypodiaceae (Polypodioid)],
    154. Phoenix - L. - [Arecaceae],
    155. Phoradendron - Nutt. - [Santalaceae (Viscaceae)],
    156. Physalis - L. - [Solanaceae],
    157. Phytolacca - L. - [Phytolaccaceae],
    158. Pimenta - Lindl. - [Myrtaceae],
    159. Pinaropappus - Less. - [Asteraceae],
    160. Piper - L. - [Piperaceae],
    161. Piqueria - Cav. - [Asteraceae],
    162. Pisonia - L. - [Nyctaginaceae],
    163. Pithecellobium - Mart. - [Fabaceae],
    164. Plantago - L. - [Plantaginaceae],
    165. Pleopeltis - Humb. & Bonpl. ex Willd. - [Polypodiaceae (Polypodioid)],
    166. Pluchea - Cass. - [Asteraceae],
    167. Plumbago - L. - [Plumbaginaceae],
    168. Plumeria - L. - [Apocynaceae],
    169. Poiretia - Vent. - [Fabaceae],
    170. Polianthes - L. - [Agavaceae],
    171. Polygala - L. - [Polygalaceae],
    172. Polygonum - L. - [Polygonaceae],
    173. Porophyllum - Adans. - [Asteraceae],
    174. Portulaca - L. - [Portulacaceae],
    175. Pouteria - Aubl. - [Sapotaceae],
    176. Prosopis - L. - [Fabaceae],
    177. Prunus - L. - [Rosaceae],
    178. Psidium - L. - [Myrtaceae],
    179. Psittacanthus - Mart. - [Loranthaceae],
    180. Psoralea - L. - [Fabaceae],
    181. Pteridium - Gled. ex Scop. - [Dennstaedtiaceae],
    182. Punica - L. - [Lythraceae (Punicaceae)],
    183. Quassia - L. - [Simaroubaceae],
    184. Quercus - L. - [Fagaceae],
    185. Randia - L. - [Rubiaceae],
    186. Ranunculus - L. - [Ranunculaceae],
    187. Ricinus - L. - [Euphorbiaceae],
    188. Rivina - L. - [Phytolaccaceae],
    189. Rosa - L. - [Rosaceae],
    190. Rosmarinus - L. - [Lamiaceae],
    191. Rubus - L. - [Rosaceae],
    192. Rumex - L. - [Polygonaceae],
    193. Russelia - Jacq. - [Scrophulariaceae (now placed in Plantaginaceae)],
    194. Ruta - L. - [Rutaceae],
    195. Salvia - L. - [Lamiaceae],
    196. Sambucus - L. - [Caprifoliaceae],
    197. Sanvitalia - Lam. - [Asteraceae],
    198. Satureja - L. - [Lamiaceae],
    199. Schinus - L. - [Anacardiaceae],
    200. Schkuhria - Roth - [Asteraceae],
    201. Sclerocarpus - Jacq. - [Asteraceae],
    202. Sedum - L. - [Crassulaceae],
    203. Selaginella - P.Beauv. - [Selaginellaceae],
    204. Senna - Mill. - [Fabaceae],
    205. Serjania - Mill. - [Sapindaceae],
    206. Sida - L. - [Malvaceae],
    207. Smilax - L. - [Smilacaceae],
    208. Solanum - L. - [Solanaceae],
    209. Sonchus - L. - [Asteraceae],
    210. Spondias - L. - [Anacardiaceae],
    211. Stachytarpheta - Vahl - [Verbenaceae],
    212. Stemmadenia - Benth. - [Apocynaceae],
    213. Stenocereus - (A.Berger) Riccob. - [Cactaceae],
    214. Syzygium - Gaertn. - [Myrtaceae],
    215. Tagetes - L. - [Asteraceae],
    216. Tamarindus - L. - [Fabaceae],
    217. Tanacetum - L. - [Asteraceae],
    218. Tecoma - Juss. - [Bignoniaceae],
    219. Teloxys - Moq. - [Chenopodiaceae (now placed in Amaranthaceae)],
    220. Ternstroemia - Mutis ex L.f. - [Theaceae],
    221. Theobroma - L. - [Sterculiaceae (now placed in Malvaceae)],
    222. Thevetia - L. - [Apocynaceae],
    223. Tilia - L. - [Tiliaceae (now placed in Malvaceae)],
    224. Tournefortia - L. - [Boraginaceae],
    225. Trichilia - P.Browne - [Meliaceae],
    226. Tridax - L. - [Asteraceae],
    227. Tropaeolum - L. - [Tropaeolaceae],
    228. Turnera - L. - [Turneraceae],
    229. Urtica - L. - [Urticaceae],
    230. Valeriana - L. - [Valerianaceae],
    231. Verbena - L. - [Verbenaceae],
    232. Verbesina - L. - [Asteraceae],
    233. Viola - L. - [Violaceae],
    234. Vitex - L. - [Verbenaceae (now placed in Lamiaceae)],
    235. Vitis - L. - [Vitaceae (Vitidaceae)],
    236. Waltheria - L. - [Sterculiaceae (now placed in Malvaceae)],
    237. Xanthosoma - Schott - [Araceae],
    238. Zea - L. - [Poaceae].
    * Although not totally comprehensive, this should be a fairly representive sample of medicinal genera used in Morelos, Mexico.

    Also provided is a supportive appendix to this summary.


    Atlas de las Plantas de la Medicina Tradicional Mexicana
    Cited as: Atlas Mexico, Oaxaca, San Luis Potosí,

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 1,
    American Journal of Pharmacy, Vol. 57, #5, pgs. 3-6.
    Cited as: AJP1885-Mexico-1.

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 2,
    American Journal of Pharmacy, Vol. 57, #6, pgs. 10-12.
    Cited as: AJP1885-Mexico-2.

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 3,
    American Journal of Pharmacy, Vol. 57, #7, pgs. 5-8.
    Cited as: AJP1885-Mexico-3.

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 4,
    American Journal of Pharmacy, Vol. 57, #8, pgs. 4-7.
    Cited as: AJP1885-Mexico-4.

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 5,
    American Journal of Pharmacy, Vol. 57, #9, pgs. 3-7.
    Cited as: AJP1885-Mexico-5.

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 6,
    American Journal of Pharmacy, Vol. 57, #10, pgs. 5-6.
    Cited as: AJP1885-Mexico-6.

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 7,
    American Journal of Pharmacy, Vol. 57, #11, pgs. 6-9.
    Cited as: AJP1885-Mexico-6.

    Editor (1885) Materia Medica of the new Mexican Pharmacopoeia, Part 8,
    American Journal of Pharmacy, Vol. 57, #12, pgs. 3-6.
    Cited as: AJP1885-Mexico-6.

    Angiosperm Phylogeny Group (1998) An ordinal classification for the families of flowering plants, Annals of the Missouri Botanical Garden 85:531-553.
    Angiosperm Phylogeny Group II (2003) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II, Botanical Journal of the Linnean Society 141:399-436.
    Cited as: APG II.
    Angiosperm Phylogeny Group (2009) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III, Botanical Journal of the Linnean Society 161 (2): 105-121.
    Cited as: APG III.

    Atlas de las Plantas de la Medicina Tradicional Mexicana
    Cited as: Atlas Mexico,

    American Botanical Council
    Cited as: Herbalgram.

    Most of the scientific names for family, genus, species, variety, and subspecies listed in this dictionary are consistent with those provided in the work of John Kartesz and the Biota of North America Program (
    This is cited as:
    BONAP or U.S.A.
    When this citation appears, it can be assumed that the plants involved are naturalized or native in the U.S.A. or North America north of Mexico.
    A scientific name, including author(s) and followed by the identifiers "Family Name, Genus Name, Species Name, Variety Name, or Subspecies Name" can be assumed to be consistent with a preferred name as listed by BONAP. If a name is not the same as that preferred or accepted by BONAP, additional comments on the reasons for this are made.
    For plants in New Mexico, some synonyms (alternative scientific names) are included according to BONAP. When common names or synonyms for scientific names are derived from this work, this is also indicated by the citation BONAP.
    For an additional sources of currently accepted scientific names and their synonyms, see:

  • Kartesz JT. (1999) A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland; In: Kartesz JT, Meacham CA, Synthesis of the North American Flora, Version 1.0; Chapel Hill: North Carolina Botanical Garden.

    Britton & Brown (1913) An Illustrated Flora of the Northern United States and Canada, 2nd Edition is cited as: northern U.S.A.
    See Medicinal Plant excerpts from Michael Moore:

    Robert A. Bye, Jr. and Edelmira Linares (1986) Ethnobotanical Notes from the Valley of San Luis, Colorado, J. Ethnobiol. 6(2):289-306.
    Cited as Bye & Linares (1986), Lower Rio Grande

    Information on wild California plants:
    Cited as: Calflora.

    Cantino, Philip D., James A. Doyle, Sean W. Graham, Walter S. Judd, Richard G. Olmstead, Douglas E. Soltis, Pamela S. Soltis & Michael J. Donoghue (2007) Towards a phylogenetic nomenclature of Tracheophyta, Taxon 56 (3) E1-E44.
    Cited as: Cantino.

    Umberto Quattrocchi, F.L.S. (2012) CRC World Dictionary of Medicinal and Poisonous Plants: Common Names, Scientific Names, Eponyms, Synonyms, and Etymology, CRC Press Taylor & Francis Group.

    Curtin, L.S.M. (1965) Healing herbs of the upper Rio Grande. Cited as: Upper Rio Grande Valley.

    Joie Davidow (1999) Infusions of Healing.
    Cited as: Maya, Mexican-American, and Nahuatl.

    Department of Agriculture Ethnobotany Database (mostly uses of medicinal plants)
    Cited as: EthnobotDB.

    The Families of Flowering Plants
    L. Watson and M. J. Dallwitz
    Cited as: Delta.

    Gonzáles-Elizondo M., López-Enrique L., González-Elizondo S., Tenla-Flores J. (2004) Plantas Medicinales del Estado de Durango y zonas aledañas, Dirección de publicaciones del Instituto Politécnico Nacional, México.
    Martha González Elizondo, I. Lorena López Enriquez, M. Socorro González Elizondo, Jorge A. Tena Flores (2004) Plantas medicinales del estado de Durango y zonas aledañas, CIIDIR Durango, Instituto Politecnico Nacional, México.
    Cited as: Durango Mexico.

    Elsa Campos is a curandera that knows plants from Morelos, Mexico.
    Cited as: Elsa Campos.


    Flora of North America @
    Cited as: FNA.

    Ford, K.C. (1975) Las Yerbas de la Gente: A Study of Hispano-American Medicinal Plants, University of Michigan, Anthropological Papers no. 60, Ann Arbor.

    Global Compositae Checklist is a searchable integrated database of nomenclatural and taxonomic information for the family Asteraceae.
    Cited as: TICA.

    Global Invasive Species Database
    Cited as Spanish, English, English-Canada, English-United Kingdom.

    Roalson and Allred (1995) A Working Index of New Mexico Vascular Plant Names, New Mexico Agr. Exp. Sta. Res. Rep. 702.
    Kelly W. Allred (2010) Flora Neomexicana I:
    The Vascular Plants of New Mexico,
    An Annotated Checklist to the Names of Vascular Plants, with Synonymy and Bibliography, Downloadable Version, Range Science Herbarium, Department of Animal & Range Sciences, New Mexico State University, Las Cruces, New Mexico
    See also Kelly Allred (2012) Flora Neomexicana. Vol. I: Annotated Checklist, 2nd Edition.
    Cited as: NM.

    International, when cited, applies to a name used by many countries.

    The International Plant Names Index.
    Cited as: IPNI.

    For plant names in Canada, Mexico, and United States, access Integrated Taxonomic Information System. Cited ITIS.
    Cited as: ITIS.

    International Union for Conservation of Nature and Natural Resources (IUCN) or World Conservation Union
    The latest update is the 2006 Red List, released on 4 May 2006.
    IUCN Red List of Threatened Species (also known as the "IUCN Red List" and "Red Data List")
    Cited as: IUCN.

    The Jepson Herbarium
    University of California, Berkeley
    Cited as: Jepson

    Charles W. Kane (2006) Herbal Medicine of the American Southwest. Lincoln Town Press. Tucson, Arizona. Cited as: American Southwest.

    Kay, M. A. (1996) Healing with plants in the American and Mexican West.
    Cited as: Aztec, Baja California, Baja California Norte, Baja California Sur, Californian Spanish, Colorado Spanish, Mexico Spanish, New Mexico Spanish, Northwestern New Spain, Southwest U.S.A./Northern Mexico or Kay.

    Vascular Plant Families and Genera
    Cited as: KEW.
    Also, includes The Plant List

    Mabberley, D.J. (1997) The plant-book, a portable dictionary of vascular plants, second edition, Cambridge University Press. Reprinted with correction 1998, 2000, 2002.
    Cited as: Plant Book.

    Mansfeld's Encyclopedia of Agricultural and Horticultural Crops (P. Hanelt & IPK (eds.) 2001, Springer), electronic version: IPK Gatersleben.
    Also Mansfeld's Encyclopedia of Agricultural and Horticultural Crops (Except Ornamentals), Springer-Verlag, Berlin, Heidelberg, New York.
    Cited as: Mansfeld's Encyclopedia, Mansfeld's Encyclopedia-Guatemala, Mansfeld's Encyclopedia-Mexico, Mansfeld's Encyclopedia-Yucatán.

    Plantas que curan is a collection of articles on Mexican medicinal plants that was featured in one of Mexico's most respected and popular tourism magazines: México Desconocido (Unknown Mexico).
    Some of this material was presented in web pages by México desconocido.
    Cited as: En Nahuatl or México Desconocido.

    Mills, Simon Y. (1988) The Dictionary of Modern Herbalism, Healing Arts Press.
    Mills, Simon Y. (1991) Out of the Earth, Viking Arkana.
    Cited as: European English.

    Multilingual Multiscript Plant Name Database
    This site (
    from the University of Melbourne provides a tool that gives plant names in different languages.
    Cited as: MMPND, MMPND-English, or MMPND-Spanish, English, or Spanish.

    Michael Moore's published works. See also Plant Images by Common English and North American Spanish Name (
    Cited as: Moore.

    Native American Ethnobotany Database
    Foods, Drugs, Dyes, and Fibers of Native North American Peoples.
    Materials provided by Dan Moerman, Professor of Anthropology.
    Cited as: NAEDB.

    Pacific Island Ecosystems at Risk project
    Cited as: PIER

    Jose Ortiz y Pino III (1972) The herbs of Galisteo and their powers, Galisteo historic museum.
    Cited as: Galisteo

    Plants For A Future: Database Search.
    Cited as: PFAF, Southwestern N. America/Mexico. is cited as PSORG.
    Cited as: PSORG.

    Sievers, A.F. (1930) The Herb Hunters Guide. Misc. Publ. No. 77. USDA, Washington DC.

    Smith, Alan R., Kathleen M. Pryer, Eric Schuettpelz, Petra Korall, Harald Schneider & Paul G. Wolf (2006) A classification for extant ferns, Taxon 55 (3) 705-731.

    Center for Sonoran Desert Studies
    South of Yécora, focused on Alamos.
    Cited as: southern Sonora.

    Botanical nomenclature of the Américas: y VOCABULARIOS/Nomenclatura Bot%E1nica-Spanish-Américas.htm
    Fundación Doctor Pando. Glosario.
    For names starting with the letter "A" try
    This work includes Spanish names of native New World plants, as well as Spanish names of some plants native to Old World, possibly introduced to New World.
    Cited as: Spanish-Américas.

    Stevens, P.F. (2001 onwards) Angiosperm Phylogeny Website.
    Cited as: APweb.

    Cited as: Tropicos, Chiapas, Honduras.

    UNEP (2004) Secretariat for the Conservation of Biological Diversity, Conference of Parties, Decision VI/9
    Global Strategy for Plant Conservation.
    2006 Catalogue of Life:
    The Global Biodiversity Information Facility (GBIF):
    Cited as: UNEP.

    Uphuf, J. C. Th. (1959) Dictionary of Economic Plants, New York.
    Cited as: Uphuf, 1959

    USDA, NRCS. 2006. The PLANTS Database (, 3 July 2006). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
    Cited as: USDA.

    Richard C. White (2003) Elsevier's dictionary of plant names of North America including Mexico, Elsevier.
    Cited as: Elsevier.
    This dictionary by Richard White contains scientific names and common names in Spanish and English for the most important plant species mainly in the southwestern United States and northern Mexico.