This name is a synonym of Centaurea alba subsp. costae (Willk.) Dostál.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 2F7E67F9-4459-4E8D-B968-0AD9477524BF) with original publication details: 91 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:954361-1.
This name was in version 1 of The Plant List, record gcc-5831.