Unknown Campanula

I sow this species as C. tatrae...all expect this one might be correct (I expect tatrae is actually just a form of rotundifolia)...however this robust species is something unknown to me.  I cannot find anything in G. Nicholls book that matches.  The plant reaches 30 cm with masses of small flowers.  The leaves are pubescent.  Could it be an unusual form of rotundifolia too?