This name is a synonym of Avena fatua var. diffusa (Neilr.) Thell..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25559464) with original publication details: Fl. Nieder-Österreich 58 1859.
This name was in version 1 of The Plant List, record tro-25559464, and has not been changed.