This name is a synonym of Festuca violacea subsp. macrathera (Hack. ex Beck) Markgr.-Dann..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50162794) with original publication details: Repert. Spec. Nov. Regni Veg. Beih. 30(3): 283 1933.
This name was in version 1 of The Plant List, record tro-50162794.