This name is a synonym of Centaurea nouelii var. duffortii Rouy & Foucaud.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 709D60AF-BD8F-4017-BE8A-26957C554DBA) with original publication details: 34 1950.
This name was in version 1 of The Plant List, record gcc-20870, and has not been changed.