Courtoisinaassimilis is the name of a species, part of the genus Courtoisina.
This name is an alternative combination by Maquet of an original description of species by Steud. under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code)..
Cyperusassimilis Steud.Cyperusassimilis is the combination used by Steud. in the original description of the species.