This name is a synonym of Campanula portenschlagiana Schult..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 365318) with original publication details: Monogr. Campan. 303 1830.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:140717-1.
This name was in version 1 of The Plant List, record kew-365318, and has not been changed.