This name is a synonym of Aristida stipitata subsp. graciliflora (Pilg.) Melderis.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 395208) with original publication details: Kirkia 3: 133 1963.
This name was in version 1 of The Plant List, record kew-395208, and has not been changed.