This name is a synonym of Poa laxiflora Buckley.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25539069) with original publication details: Contr. U.S. Natl. Herb. 13: 71 1910.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:204330-2.
This name was in version 1 of The Plant List, record tro-25539069, and has not been changed.