This name is a synonym of Helictotrichon sedenense (DC.) Holub.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25559706) with original publication details: Syn. Mitteleur. Fl. 2: 249 1899.
This name was in version 1 of The Plant List, record tro-25559706.