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 443183) with original publication details: Man. Fl. N. States 71 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:240811-2.
This name was in version 1 of The Plant List, record kew-443183.