This article is about the formal taxonomic term in botany. For the use in zoology, see Form (zoology). For the informal botanical grouping, see Forma specialis.
The hierarchy of biological classification's eight major taxonomic ranks. Intermediate minor rankings are not shown.Seedlings of Abies procera sometimes arise that have attractive silvery-blue foliage. The name Abies procera Rehder forma glauca (Ravenscr.) Rehder has been created for these. However, if the plants are selectively propagated for the horticulture trade, a cultivar name is generally used instead.
The abbreviation "f." or the full "forma" should be put before the infraspecific epithet to indicate the rank. It is not italicised.
Acanthocalycium spiniflorum forma klimpelianum (Weidlich & Werderm.) Donald
Crataegus aestivalis (Walter) Torr. & A.Gray var. cerasoides Sarg. f. luculenta Sarg. is a classification of a plant whose name is:
Crataegus aestivalis (Walter) Torr. & A.Gray f. luculenta Sarg.
A form usually designates a group with a noticeable morphological deviation. The usual taxonomic practice is that the individuals classified within the form are not necessarily known to be closely related (they may not form a clade).[2] For instance, white-flowered plants of species that usually have coloured flowers can be grouped and named (e.g., as "f. alba"). Formae apomicticae are sometimes named among plants that reproduce asexually, by apomixis. There are theoretically countless numbers of forms based on minor genetic differences, and only a few that have particular significance are likely to be named.
^McNeill, J.; Barrie, F.R.; Buck, W.R.; Demoulin, V.; Greuter, W.; Hawksworth, D.L.; Herendeen, P.S.; Knapp, S.; Marhold, K.; Prado, J.; Prud'homme Van Reine, W.F.; Smith, G.F.; Wiersema, J.H.; Turland, N.J. (2012). International Code of Nomenclature for algae, fungi, and plants (Melbourne Code) adopted by the Eighteenth International Botanical Congress Melbourne, Australia, July 2011. Vol. Regnum Vegetabile 154. A.R.G. Gantner Verlag KG. ISBN978-3-87429-425-6. Chapter I. Article 4
^Hamilton, C.W.; Reichard, S.H. (1992), "Current Practice in the Use of Subspecies, Variety, and Forma in the Classification of Wild Plants", Taxon, 41 (3): 485–498, doi:10.2307/1222819, JSTOR 1222819
April 26, 2024
form, botany, this, article, about, formal, taxonomic, term, botany, zoology, form, zoology, informal, botanical, grouping, forma, specialis, botanical, nomenclature, form, forma, plural, formae, secondary, taxonomic, ranks, below, that, variety, which, turn, . This article is about the formal taxonomic term in botany For the use in zoology see Form zoology For the informal botanical grouping see Forma specialis In botanical nomenclature a form forma plural formae is one of the secondary taxonomic ranks below that of variety which in turn is below that of species it is an infraspecific taxon 1 If more than three ranks are listed in describing a taxon the classification is being specified but only three parts make up the name of the taxon a genus name a specific epithet and an infraspecific epithet The hierarchy of biological classification s eight major taxonomic ranks Intermediate minor rankings are not shown Seedlings of Abies procera sometimes arise that have attractive silvery blue foliage The name Abies procera Rehder forma glauca Ravenscr Rehder has been created for these However if the plants are selectively propagated for the horticulture trade a cultivar name is generally used instead The abbreviation f or the full forma should be put before the infraspecific epithet to indicate the rank It is not italicised For example Acanthocalycium spiniflorum f klimpelianum or Acanthocalycium spiniflorum forma klimpelianum Weidlich amp Werderm Donald Crataegus aestivalis Walter Torr amp A Gray var cerasoides Sarg f luculenta Sarg is a classification of a plant whose name is Crataegus aestivalis Walter Torr amp A Gray f luculenta Sarg A form usually designates a group with a noticeable morphological deviation The usual taxonomic practice is that the individuals classified within the form are not necessarily known to be closely related they may not form a clade 2 For instance white flowered plants of species that usually have coloured flowers can be grouped and named e g as f alba Formae apomicticae are sometimes named among plants that reproduce asexually by apomixis There are theoretically countless numbers of forms based on minor genetic differences and only a few that have particular significance are likely to be named See also editForm zoology Forma specialis an informal rank used for a parasitic form adapted to a particular host Trinomial nomenclature Variety botany Subvariety Plant variety disambiguation Cultivar Hybrid biology Race biology References edit McNeill J Barrie F R Buck W R Demoulin V Greuter W Hawksworth D L Herendeen P S Knapp S Marhold K Prado J Prud homme Van Reine W F Smith G F Wiersema J H Turland N J 2012 International Code of Nomenclature for algae fungi and plants Melbourne Code adopted by the Eighteenth International Botanical Congress Melbourne Australia July 2011 Vol Regnum Vegetabile 154 A R G Gantner Verlag KG ISBN 978 3 87429 425 6 Chapter I Article 4 Hamilton C W Reichard S H 1992 Current Practice in the Use of Subspecies Variety and Forma in the Classification of Wild Plants Taxon 41 3 485 498 doi 10 2307 1222819 JSTOR 1222819 Retrieved from https en wikipedia org w index php title Form botany amp oldid 1171073588, wikipedia, wiki, book, books, library,
