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 266013) with original publication details: Rhodora 39: 189 1937.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:241066-2.
This name was in version 1 of The Plant List, record kew-266013, and has not been changed.