This name is a synonym of Aristida mendocina Phil..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 394758) with original publication details: Revista Soc. Argent. Ci. Nat. 8: 76 1925.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:19224-2.
This name was in version 1 of The Plant List, record kew-394758, and has not been changed.