This name is a synonym of Hyparrhenia welwitschii (Rendle) Stapf.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 419768) with original publication details: Fl. Trop. Afr. 9: 357 1918.
This name was in version 1 of The Plant List, record kew-419768, and has not been changed.