This name is a synonym of Cyanus nigrofimbrius (K.Koch) Soják.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100374004) with original publication details: Linnaea 23: 426 .
This name record (from Tropicos) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Centaurea montana in version 1 of The Plant List.