This name is a synonym of Sorghastrum nutans (L.) Nash.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 445901) with original publication details: Fl. Carol. 78 1788.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:423862-1.
This name was in version 1 of The Plant List, record kew-445901.