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 394942) with original publication details: Anales Mus. Nac. Montevideo 4(1): 75 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:19283-2.
This name was in version 1 of The Plant List, record kew-394942.