This name is a synonym of Schoenoplectus lacustris subsp. hippolyti (V.I.Krecz.) Kukkonen.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 264224) with original publication details: Bot. Mater. Gerb. Bot. Inst. Komarova Akad. Nauk S.S.S.R. 7: 28 1937.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:313684-1.
This name was in version 1 of The Plant List, record kew-264224, and has not been changed.