This name is a synonym of Cyanus depressus (M.Bieb.) Soják.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record C6A9E3EF-95C9-4064-B1A3-A1B295CC9978).
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 depressa in version 1 of The Plant List.