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 0814FACD-0DB6-4191-A54A-C0CCF7A7D440) with original publication details: Linnaea 30 115 1859.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:190271-1.
This name was in version 1 of The Plant List, record gcc-117491.