This name is a synonym of Trisetum rigidum (M.Bieb.) Roem. & Schult..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25528375) with original publication details: Fl. Taur.-Caucas. 1: 77 1808.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:391720-1.
This name was in version 1 of The Plant List, record tro-25528375.