This name is a synonym of Centaurea nigra subsp. aterrima (Hayek) Hayek.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 20DB7E41-0AD6-46CF-A812-3636B4623D92) with original publication details: 731 1901.
This name was in version 1 of The Plant List, record gcc-29343, and has not been changed.