This name is a synonym of Poa obvallata Steud..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 436828) with original publication details: Syn. Pl. Glumac. 1: 258 1854.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:417728-1.
This name was in version 1 of The Plant List, record kew-436828, and has not been changed.