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 435947) with original publication details: Fl. Carniol. ed. 2, 1: 73 1771.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:417066-1.
This name was in version 1 of The Plant List, record kew-435947.