This name is a synonym of Centaurea aggregata Fisch. & C.A.Mey. ex DC..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record D131DC18-841C-4EB1-BDAF-27CA4B94287E).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Centaurea aggregata in version 1 of The Plant List.