This name is a synonym of Elodea bifoliata H.St.John.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 309468) with original publication details: Res. Stud. Washington State Univ. 30: 41 1962.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:431722-1.
This name was in version 1 of The Plant List, record kew-309468, and has not been changed.