This name is a synonym of Centaurea sphaerocephala subsp. malacitana (Boiss.) Dostál.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record B0EFB92D-77A8-4FDC-943D-45B11166E62B) with original publication details: 85 1856.
This name was in version 1 of The Plant List, record gcc-37589, and has not been changed.