|INTERNATIONAL CODE OF BOTANICAL NOMENCLATURE online|
3.1. The principal ranks of taxa in descending sequence are: kingdom (regnum), division or phylum (divisio, phylum), class (classis), order (ordo), family (familia), genus (genus), and species (species). Thus, each species is assignable to a genus, each genus to a family, etc.
3.2. The principal ranks of nothotaxa (hybrid taxa) are nothogenus and nothospecies. These ranks are the same as genus and species. The prefix "notho" indicates the hybrid character (see App. I).
(c) 2006, by International Association for Plant Taxonomy. This page last updated 09.03.2007 .