This name is a synonym of Centaurea jordaniana subsp. aemilii (Briq.) Kerguélen.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 1CC8FEA3-3345-457D-8D39-9E93C8456992) with original publication details: 91 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:189807-1.
This name was in version 1 of The Plant List, record gcc-102223.