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 394872) with original publication details: Meded. Rijks-Herb. 54A: 267 1927.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:19255-2.
This name was in version 1 of The Plant List, record kew-394872, and has not been changed.