This name is a synonym of Sparganium angustifolium Michx..
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 266158) with original publication details: Fl. New York 2: 249 1847.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:241090-2.
This name was in version 1 of The Plant List, record kew-266158.