This name is a synonym of Aristida longiseta Steud..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 395074) with original publication details: Intermountain Fl. 6: 456 1977.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:19323-2.
This name was in version 1 of The Plant List, record kew-395074.