This name is a synonym of Centaurea cineraria L..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 7D62DC7C-6B99-40C3-A45E-3F41CD3E7D02).
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 gymnocarpa in version 1 of The Plant List.