This name is a synonym of Aira flexuosa var. diffusa (Neilr.) Briq..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25557233) with original publication details: Fl. Nieder-Österreich 55 1859.
This name was in version 1 of The Plant List, record tro-25557233.