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 417696) with original publication details: Enum. Pl. Transsilv. 781 1866.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:404034-1.
This name was in version 1 of The Plant List, record kew-417696.