You selected Cyperus echinatus var. multiflorus Britton. This is a synonym for:

Accepted scientific name:
Cyperus croceus Vahl (accepted name) 1 literature reference for Cyperus croceus Vahl
Synonyms:
Cyperus baldwinii Torr. (synonym) 1 literature reference for Cyperus baldwinii Torr.
Cyperus cyclostachyus Griseb. (synonym) 1 literature reference for Cyperus cyclostachyus Griseb.
Cyperus echinatus var. multiflorus Britton (synonym) 1 literature reference for Cyperus echinatus var. multiflorus Britton
Cyperus globulosus var. multiflorus Kük. & Ekman (synonym) 1 literature reference for Cyperus globulosus var. multiflorus Kük. & Ekman
Cyperus globulosus var. pseudofiliculmis Kük. (synonym) 1 literature reference for Cyperus globulosus var. pseudofiliculmis Kük.
Cyperus multiflorus (Britton) Small (synonym) 1 literature reference for Cyperus multiflorus (Britton) Small
Dichostylis baldwinii (Torr.) Palla (synonym) 1 literature reference for Dichostylis baldwinii (Torr.) Palla
Common names: -
Classification:
Plantae
Phylum Magnoliophyta
Class Liliopsida
Order Poales
Family Cyperaceae
Genus Cyperus
Distribution: C. & E. U.S.A. to Trop. America
Additional data: -
Source database: World Checklist of Selected Plant Families, 27 Nov 2009
Latest taxonomic scrutiny: Govaerts R., 21-Jun-2005
Online resource: http://apps.kew.org/wcsp/namedetail.do?accepted_id=236201&repSynonym_id=-9998&name_id=236201&status=true
CoL taxon LSID: urn:lsid:catalogueoflife.org:taxon:f1c43422-29c1-102b-9a4a-00304854f820:ac2010