Eleocharisflavescens is the name of a species, part of the genus Eleocharis.
This name is an alternative combination by Urb. of an original description of species by Poir. under the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN / commonly called the botany code)..
Scirpusflavescens Poir.Scirpusflavescens is the combination used by Poir. in the original description of the species.