This name is a synonym of Glyceria fluitans (L.) R.Br..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 435358) with original publication details: Nuove Pianti 5 1838.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:416586-1.
This name was in version 1 of The Plant List, record kew-435358.