This name is a synonym of Sparganium gramineum Georgi.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym and as an illegitimate name (record 266111) with original publication details: Bot. Not. 1849: 13 1849.
This name was in version 1 of The Plant List, record kew-266111, and has not been changed.