This name is a synonym of Schoenoplectus lacustris (L.) Palla.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 262999) with original publication details: Acta Bot. Acad. Sci. Hung. 16: 369 1970 publ. 1971.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:879782-1.
This name was in version 1 of The Plant List, record kew-262999.