This name is a synonym of Poa supina Schrad..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 437426) with original publication details: Candollea 29: 48 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:882861-1.
This name was in version 1 of The Plant List, record kew-437426.