This name is a synonym of Aristida caput-medusae Domin.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 395300) with original publication details: Fl. Austral. 7: 563 1878.
This name was in version 1 of The Plant List, record kew-395300, and has not been changed.