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Plant Nomenclature Bio 218 Fall 2012 Dr. Dale Benham.

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1 Plant Nomenclature Bio 218 Fall 2012 Dr. Dale Benham

2 Three parts to a binomial Erythronium albidum Nutt. 1. Genus (plural = genera) Latin (or Latinized) = underline or italicize noun - gendered: masculine, feminine, neuter 2. specific epithet (= species according to some) Latin (or Latinized) = underline or italicize adjective or a possessive noun 3. Authority scientist naming the species (abbreviated name) rarely used, except for the initial time in an article Original author(s) ALWAYS remain with name becomes parenthetical author(s) when new combination occurs combining author(s) of NEW combination at end - all others removed

3 International Code of Botanical Nomenclature (ICBN) Two basic activities naming new taxa determining the correct name for previously named taxa

4 International Code of Botanical Nomenclature (ICBN) precise and simple system dealing with: terms which denote the ranks of taxonomic groups or units [subspecies, family, genus, species, variety, etc.] the scientific names which are applied to the individual taxonomic groups of plants

5 Principles of Nomenclature p independent of zoological nomenclature 2.application of names of taxonomic groups is determined by means of nomenclatural types the specimen which the author cites in the original description - purely a nomenclatural device, not a biological model holotype - the single specimen designated by the author from the original collection of the new entity isotype - duplicates of the holotype lectotype - chosen by someone other than the author, but based on the author's collection neotype - chosen in absence of any material from the author syntype - any one of 2 or more specimens cited by the author when no holotype was designated, or any one of two or more specimens simultaneously designated as types topotype - specimen of a named taxon collected from the original type locality

6 Type specimen designated as specimen on which the species description is based dried plant specimen stored in herbarium or museum serves as basis for comparison

7 Principles of Nomenclature 3.Nomenclature of a taxonomic group is based upon priority - the earliest that is in accordance with the Rules is that correct name 4.only one correct name exists for each taxon valid publication is needed, including the following: begins 1 May 1753, with the publication of Species Plantarum by Linnaeus effective publication (published in printed matter generally available to botanists) As of 1 Jan 2012: Electronic material published online in Portable Document Format (PDF) with an International Standard Serial Number (ISSN) or an International Standard Book Number (ISBN) will constitute effective publication publication in the form specified for the name of each category of taxa

8 Principles of Nomenclature publication with a description or diagnosis (or a reference to a previously published description or diagnosis) accompaniment by a Latin description or diagnosis or by a reference to a previously and effectively published Latin description or diagnosis of the taxon As of 1 Jan 2012: A description or diagnosis may be in either Latin or English 5.Scientific names of taxonomic groups are treated as Latin regardless of their derivation 6.The Rules of Nomenclature are retroactive unless expressly limited

9 Some rules about binomials Binomial = scientific name = species (plural & singular) genus + specific epithet First letter of genus is the only letter capitalized = Quercus rubra No article is used before the name, since it is a proper name ≠ the Abies concolor Genus is sometimes abbreviated with first letter followed by a period = Acer saccharinum becomes A. saccharinum No tautonomy (repetition of generic and specific epithet names) Rosa rosa is an illegitimate name

10 Infraspecific Taxa Taxon (taxa = plural) a group of organisms of any rank given formal recognition in a classification hierarchy (e.g., class, order, family, genus, species, variety) Geographical variation in a species is sometimes noted subspecies (ssp. or subsp.) varieties (var.) Sporatic, non-geographical variation normally not named, but some designate as forms (f.)

11 Do Names Change? 1.Change of taxonomic position: E.g., Sedum variegata transferred to the genus Dudleya, the new species Dudleya variegata 2.Change in taxonomic rank: E.g., Larrea divaricata ssp. tridentata changed to species rank: Larrea tridentata

12 Basionym 1.The “name bearing” name Basionym remains in new name, along with original author 2.Keeping track of name changes E.g., Sedum variegata S. Watson was transferred to the genus Dudleya by Moran, new species name is: Dudleya variegata (S. Watson) Moran [Note: Sedum variegata S. Watson is the basionym] E.g., Muhlenbergia shepherdii (Vasey) Swallen transferred to Blepharoneuron by P. M. Peterson & Annable, new name: Blepharoneuron shepherdii (Vasey) P. M. Peterson & Annable

13 Autonyms: Automatically created name for infrafamilial, infrageneric, and infraspecific taxa E.g., Lotus stipularis (Benth.) Greene split by Isely into 2 varieties: Lotus stipularis (Benth.) Greene var. ottleyi Isely Lotus stipularis (Benth.) Greene var. stipularis Later, genus Hosackia accepted: Hosackia stipularis Benth. var. ottleyi (Isely) Brouillet Hosackia stipularis Benth. var. stipularis

14 Fig p. 616

15 What is a synonym? a rejected name, by a particular author or authors Synonyms usually indicated in brackets; e.g., Malosma laurina (Nutt.) Abrams [Rhus laurina Nutt.] illegitimate taxonomic judgement Why rejected ?

16 What is a correct name? A legitimate (and therefore validly published) name that is accepted by a particular author or authors. Each taxon can have only one correct name. How can a name be legitimate but not correct? There may be 2 (or more) alternative, legitimate names. Only one of these can be correct (in any given work).

17 Tracing Nomenclatural History Notholaena cochisensis Goodding Cheilanthes cochisensis (Goodding) Mickel Cheilanthes sinuata (Lagasca ex Swartz) Domin var. cochisensis (Goodding) Munz Notholaena sinuata (Lagasca ex Swartz) Kaulfuss var. cochisensis (Goodding) Weatherby Astrolepis cochisensis (Goodding) D. M. Benham & Windham

18 Malacothrix incana (Nutt.) Torrey & A. Gray [Malacomeris incanus Nutt.] (=basionym) Porophyllum gracile Benth. [P. caesium Greene; P. vaseyi Greene] Gilia diegensis (Munz) A. D. & V. E. Grant [Gilia inconspicua (Sm.) Sweet var. diegensis Munz] (=basionym) Other examples of synonyms

19 Abbreviations: "in" = "in the publication of" E.g., Arabis sparsiflora Nutt. in T. & G. May be abbrev: Arabis sparsiflora Nutt. "ex" = "validly published by." E.g., Microseris elegans Greene ex A. Gray May be abbrev.: Microseris elegans A. Gray.

20 Abbreviations "x" = a hybrid. E.g., Salvia xpalmeri (A. Gray) Greene = S. apiana x S. clevelandii. "sp. nov." = species novum E.g., "Eryngium pendletonense sp. nov." "cf." = confer, meaning "compare." E.g., "Calyptridium cf. monandrum"


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