This name is a synonym of Aristida longicollis (Domin) Henrard.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 394340) with original publication details: Biblioth. Bot. 20: 343 1915.
This name was in version 1 of The Plant List, record kew-394340, and has not been changed.