This name is a synonym of Aristida laxa Cav..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 394776) with original publication details: Sp. Gram. Stipac. 121 1842.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:389521-1.
This name was in version 1 of The Plant List, record kew-394776.