International Code of Botanical Nomenclature
(Tokyo Code), Electronic version
CHAPTER III. NOMENCLATURE OF TAXA ACCORDING TO THEIR RANK
SECTION 5. NAMES OF TAXA BELOW THE RANK OF SPECIES
(INFRASPECIFIC TAXA)
Article 27
27.1. The final epithet in the name of an infraspecific
taxon may not repeat unchanged the epithet of the correct name
of the species to which the taxon is assigned unless the two names
have the same type.
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