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 3173B8D4-ECCA-4AB1-A981-362E22EE5492) with original publication details: 135 1846.
This name was in version 1 of The Plant List, record gcc-29316, and has not been changed.