This name is a synonym of Centaurea nigra subsp. carpetana (Boiss. & Reut.) Nyman.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record DF39056B-6923-4ADD-A5B3-9D67B576394B) with original publication details: 65 1852.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:190152-1.
This name was in version 1 of The Plant List, record gcc-101729, and has not been changed.