This name is a synonym of Campanula sibirica subsp. elatior (Fomin) Fed..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 364296) with original publication details: Zametki Sist. Geogr. Rast. 17: 100 1953.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:140118-1.
This name was in version 1 of The Plant List, record kew-364296, and has not been changed.