This name is a synonym of Muhlenbergia virescens (Kunth) Kunth.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 437774) with original publication details: Nov. Gen. Sp. 1: 132 1816.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:418442-1.
This name was in version 1 of The Plant List, record kew-437774, and has not been changed.