This name is a synonym of Centaurea hanryi subsp. isernii (Willk.) Smythies.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record E4DA094F-E486-4496-AFF2-653EEDD34425) with original publication details: 155 1865.
This name was in version 1 of The Plant List, record gcc-76700, and has not been changed.