This name is a synonym of Sparganium emersum Rehmann.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 266049) with original publication details: Taxon 19: 797 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:241078-2.
This name was in version 1 of The Plant List, record kew-266049.