This name is a synonym of Schoenoplectiella supina (L.) Lye.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 263097) with original publication details: Bot. Jahrb. Syst. 10: 299 1888.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1019169-1.
This name was in version 1 of The Plant List, record kew-263097.