This name is a synonym of Centaurea nigra L..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record DA4EF422-5B3F-4612-84F8-DC90A271C9ED).
This name record (from TICA) 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 nigra in version 1 of The Plant List.