This name is a synonym of Cheirolophus junonianus (Svent.) Holub.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 6B59C979-5028-472D-A505-B354FF221B44).
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 junoniana in version 1 of The Plant List.