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 266040) with original publication details: Rhodora 9: 88 1907.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:241076-2.
This name was in version 1 of The Plant List, record kew-266040.