Concept

Form (botany)

Summary
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. 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 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 & 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
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