This name is a synonym of Sparganium americanum Nutt..
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 266154) with original publication details: Nat. Pflanzenfam. 2(1): 192 1887.
This name was in version 1 of The Plant List, record kew-266154, and has not been changed.