This name is a synonym of Avenastrum pubescens var. stenophylum (Domin) Podp..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25559872) with original publication details: Repert. Spec. Nov. Regni Veg. 1: 16 1905.
This name was in version 1 of The Plant List, record tro-25559872.