This name is a synonym of Volutaria abyssinica (Sch.Bip. ex A.Rich.) C.Jeffrey ex Cufod..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 74C6DFC3-7625-4263-8C3B-41A01D9E5E20).
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 hochstetteri in version 1 of The Plant List.