International Code of Botanical NomenclatureThe International Association for Plant Taxonomy
is maintained by the International Association for Plant Taxonomy. Every individual plant can belong to multiple taxa
but they are always part of a species
. The code calls for the material on which a taxon is based, to be deposited and preserved in a herbarium
Botanical nomenclature is independent of zoological and bacteriological nomenclature. There have been several versions of the code; the most recent is the 'St Louis code' and was adopted in 1999.