This name is a synonym of Sparganium eurycarpum subsp. coreanum (H.Lév.) C.D.K.Cook & M.S.Nicholls.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 266061) with original publication details: J. Jap. Bot. 51: 229 1976.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:891723-1.
This name was in version 1 of The Plant List, record kew-266061.