This name is a synonym of Najas marina subsp. arsenariensis (Maire) L.Triest.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 308226) with original publication details: Bull. Soc. Hist. Nat. Afrique N. 32: 215 1931.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:602991-1.
This name was in version 1 of The Plant List, record kew-308226, and has not been changed.