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Forma (Form)  [ Taxonomy ]
Abbreviation:  f.

Dictionary of botanic terminology - index of names

  An infraspecific rank below variety, this is the smallest taxonomic category, generally used for sporadic or minor variations occurring among individuals of any population,  mainly in horticultural applications. (e.g. spine length, flower or fruit colour , or habit response)  
From the Latin word "forma" meaning  “form, shape”

The abbreviation f. is used to signify that the mutation is a form. forma (f.) is placed after the specific epithet and is not underlined or italicized.
How to write the botanical name of a  form:
1.         The form name is written after (forma) f..
2.         Do not capitalize the form name.
3.         Underline or italicize the form name but not the form designation.
Example: Strombocactus disciformis f.
cristata (Strombocactus disciformis forma cristata)

See the list of:
  Glossary of  cactus and succulent SPECIES epithets (comprising subspecies, variety and forms)



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