This name is a synonym of Aristida stipitata subsp. robusta (Stent & J.M.Rattray) Melderis.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 395209) with original publication details: Kirkia 3: 133 1963.
This name was in version 1 of The Plant List, record kew-395209, and has not been changed.