This name is a synonym of Aristida ramosissima Engelm. ex A.Gray.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25546951) with original publication details: Ill. Fl. Illinois 329 1973.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:19328-2.
This name was in version 1 of The Plant List, record tro-25546951, and has not been changed.