This name is a synonym of Najas marina var. intermedia (Wolfg. ex Gorski) Rendle.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 309128) with original publication details: Fl. France 13: 294 1912.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:602982-1.
This name was in version 1 of The Plant List, record kew-309128.