This name is a synonym of Campanula rumeliana (Hampe) Vatke.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 364926) with original publication details: Endemic Pl. Greece, Peloponnese 360 2001.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:20002386-1.
This name was in version 1 of The Plant List, record kew-364926.