This name is a synonym of Centaurea seridis subsp. sonchifolia (L.) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 02CC31FA-E0F7-4B1C-8776-14A21B8C194D) with original publication details: 431 1879.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:191081-1.
This name was in version 1 of The Plant List, record gcc-11036.