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 1C1D3FE1-0D82-49EC-A067-AF9EB412C1F9) with original publication details: xii 1993.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:971184-1.
This name was in version 1 of The Plant List, record gcc-62533.