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The code is maintained by the International Association for Plant Taxonomy. There have been several versions of the code; the most recent is the 'St Louis code' which was adopted in 1999.
The nomenclature code should not be confused with the scientific_classification of living things.
Botanical nomenclature is independent of zoological and bacteriological nomenclature. It follows the same general principles as the other two codes however, including the use of a binomial name for each species. For a general account of the use of scientific names across botany, zoology and bacteriology, see binomial nomenclature.
The code calls for the material from which a taxon is described, and on which a taxon is based, to be deposited and preserved in a herbarium.