This name is a synonym of Stipagrostis zeyheri subsp. macropus (Nees) De Winter.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25507287) with original publication details: Sp. Gram. Stipac. 179 1842.
This name was in version 1 of The Plant List, record tro-25507287.