This name is a synonym of Centaurea nigrescens subsp. neapolitana (Boiss.) Dostál.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 4B2ED2CA-BE3C-4A49-84CE-4F14BD0C32D1) with original publication details: 72 1856.
This name was in version 1 of The Plant List, record gcc-42691, and has not been changed.