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 424790) with original publication details: Handb. Skand. Fl. 56 1820.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:408816-1.
This name was in version 1 of The Plant List, record kew-424790.