This name is a synonym of Sparganium americanum Nutt..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50337518) with original publication details: Annual Rep. Mich. Acad. Sci. 6: 202 1904.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:241088-2.
This name was in version 1 of The Plant List, record tro-50337518, and has not been changed.