This name is a synonym of Centaurea regia subsp. cynarocephala (Wagenitz) Wagenitz.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 52F28C42-7C30-402E-9E4D-903B5E678D7D) with original publication details: Willdenowia 2 477 1960.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:190313-1.
This name was in version 1 of The Plant List, record gcc-95821, and has not been changed.