This name is a synonym of Centaurea spruneri subsp. guicciardii (Boiss.) Hayek.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record FE9FCE61-68E9-427F-B28A-43E2D1CF40A3).
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 guicciardii in version 1 of The Plant List.