This name is a synonym of Aristida arabica (Trin. & Rupr.) Trin. & Rupr. ex Henrard.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25530100) with original publication details: Sp. Gram. Stipac. 135 1842.
This name was in version 1 of The Plant List, record tro-25530100, and has not been changed.