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 3D636CD0-D044-477F-8DAA-BBFA16ED5F7C) with original publication details: Bull. Soc. Bot. France 7 348 1860.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:190757-1.
This name was in version 1 of The Plant List, record gcc-115361.