This name is a synonym of Aristida laevis (Nees) Kunth.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 394511) with original publication details: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 1: 85 1831.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:389332-1.
This name was in version 1 of The Plant List, record kew-394511, and has not been changed.