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Originally Posted by Caloosamusa
What are the differences (by definition) between variety and forms? 
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In botany, different variations within a species are denominated explicitly as subspecies (subsp.), variaties ( var.) or forms (forma)
here are definitions of the following taxonomic ranks in the International Code of Botanical Nomenclature: kingdom (regnum), subregnum, division or phylum (divisio, phylum), subdivisio or subphylum, class (classis), subclassis, order (ordo), subordo, family (familia), subfamilia, tribe (tribus), subtribus, genus (genus), subgenus, section (sectio), subsectio, series (series), subseries, species (species), subspecies, variety (varietas), subvarietas, form (forma), subforma.
In botanical nomenclature, a subvariety (subvarietas) is a taxonomic rank below that of variety (varietas) but above that of form (forma):
You did ask
