This name is a synonym of Centaurea glaberrima Tausch.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record BBDDE05F-1624-4A21-B1C8-6E7EB00AE8B5).
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 glaberrima in version 1 of The Plant List.