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 and as an invalid name (record 389590) with original publication details: Syst. Veg. 1: 326 1817.
This name was in version 1 of The Plant List, record kew-389590, and has not been changed.