Campanula cochlearifolia (syn.C.pusilla) 9cm

from European Alps.  Dwarf perennial species very easily grown, producing a mat of  small tufts of round mid-green shallowly toothed leaves.  Wiry stems carry small bell-dhaped flowers from July to September.  Planting distance 12" (30cm).  Ht 4-6" (10-15cms) when in flower.