This name is a synonym of Campanula transsilvanica Schur ex André.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 5501500) with original publication details: Fl. Polska 12: 67 1971.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:875486-1.
This name was in version 1 of The Plant List, record tro-5501500, and has not been changed.