This name is a synonym of Aristida spegazzinii Arechav..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 394958) with original publication details: Contr. Fl. Sierra Vent. 62 1896.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:19287-2.
This name was in version 1 of The Plant List, record kew-394958, and has not been changed.