This name is a synonym of Centaurea thuillieri (Dostál) J.Duvign. & Lambinon.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record D2C158A0-CF33-4945-800B-20DFB4810778) with original publication details: Smythies in Englera 3. 1984. 137 1984.
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 debeauxii in version 1 of The Plant List.