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 250569) with original publication details: Prodr. Fl. Nov. Holl. 221 1810.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1073959-2.
This name was in version 1 of The Plant List, record kew-250569.