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 and as an illegitimate name (record 266157) with original publication details: Bull. Torrey Bot. Club 15: 79 1888.
This name was in version 1 of The Plant List, record kew-266157.