In botanical nomenclature, an infraspecific taxon is a taxon at a rank below that of species (i.e. within a species, infra = inside). An infraspecific taxon gets a ternary name. Botanical nomenclature Plants are given formal names, governed by the ICBN. Within the limits set by the ICBN there is a separate set of rules, the ICNCP, for those plants in cultivation that require separate recognition, so-called cultivars. ... In botanical nomenclature, a taxon is usually assigned to a rank in a hierarchy. ... In botanical nomenclature, the ICBN prescribes a three part name (ternary name) for any taxon below the rank of species. ...