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 366330) with original publication details: Mater. Fl. Kavk. 4(6): 23 1904.
This name was in version 1 of The Plant List, record kew-366330, and has not been changed.