This name is a synonym of Centaurea amblensis Graells.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 48CB348C-D6C9-4428-B715-0B3808BED87A).
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 amblensis in version 1 of The Plant List.