This name is a synonym of Centaurea phrygia subsp. razgradensis (Velen.) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 1A313757-C0B9-4DFD-BC6D-C38DD7871B42) with original publication details: 166 1907.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:190093-1.
This name was in version 1 of The Plant List, record gcc-118705.