This name is a synonym of Schoenoplectus acutus var. occidentalis (S.Watson) S.G.Sm..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 338272) with original publication details: Ill. Fl. Illinois, Sedges: Cyperus to Scleria ed. 2: 201 2001.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1206193-2.
This name was in version 1 of The Plant List, record kew-338272, and has not been changed.