Form (botany)
In botanical nomenclature, a form (Latin: forma, plural: formae) is one of the "secondary" taxonomic ranks, below that of variety, which in turn is below that of subspecies and 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.