This name is a synonym of Centaurea resupinata subsp. dufourii (Dostál) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record E1A43248-2652-469A-9319-BC85B6A81D49) with original publication details: 201 1976.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:876815-1.
This name was in version 1 of The Plant List, record gcc-64186.