This name is a synonym of Centaurea nigrescens subsp. transalpina (Schleich. ex DC.) Nyman.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record CE33F3A3-D7A0-42F1-A2AF-0055A1BEFBE1) with original publication details: 202 1802.
This name was in version 1 of The Plant List, record gcc-188.