This name is a synonym of Bouteloua curtipendula (Michx.) Torr..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 406398) with original publication details: Ann. Sci. Nat. (Paris) 5: 303 1825.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1118231-2.
This name was in version 1 of The Plant List, record kew-406398.