This name is a synonym of Aristida filifolia (Arechav.) Herter.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 395120) with original publication details: Revista Sudamer. Bot. 9: 99 1953.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:19338-2.
This name was in version 1 of The Plant List, record kew-395120.