This name is a synonym of Hilaria jamesii (Torr.) Benth..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an invalid name (record 418959) with original publication details: J. Linn. Soc., Bot. 19: 62 1881.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:404953-1.
This name was in version 1 of The Plant List, record kew-418959, and has not been changed.