This name is a synonym of Muhlenbergia glomerata (Willd.) Trin..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 438122) with original publication details: Pl. Nov. Herb. Spreng. 7 1807.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:207851-2.
This name was in version 1 of The Plant List, record kew-438122, and has not been changed.