This name is a synonym of Centaurea calcitrapa subsp. angusticeps (H.Lindb.) Meikle.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record F56790F5-958B-47A1-96A9-3BEB1867B8AA) with original publication details: 34 1946.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:189883-1.
This name was in version 1 of The Plant List, record gcc-32327, and has not been changed.