Gymnocalycium denudatum (Link & Otto) Pfeiffer
Gymnocalycium denudatum is the name of a species, part of the genus Gymnocalycium.
This name is an alternative combination by Pfeiffer of an original description of species by Link & Otto under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code)..
Botany
