This name is a synonym of Campanula bononiensis L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 364121) with original publication details: Comp. Fl. Ital. 455 1882.
This name record (from WCSP) 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 Campanula bononiensis in version 1 of The Plant List.