DIVISION I. PRINCIPLES
The nomenclature of algae, fungi, and plants is independent of zoological and bacteriological nomenclature. This Code applies equally to names of taxonomic groups treated as algae, fungi, or plants, whether or not these groups were originally so treated (see Pre. 8).
The application of names of taxonomic groups is determined by means of nomenclatural types.
The nomenclature of a taxonomic group is based upon priority of publication.
Each taxonomic group with a particular circumscription, position, and rank can bear only one correct name, the earliest that is in accordance with the rules, except in specified cases.
Scientific names of taxonomic groups are treated as Latin regardless of their derivation.
The rules of nomenclature are retroactive unless expressly limited.