The very trees by the river's brink become puny and stunted; the evergreens begin to replace the deciduous growths; in the shade of dwarfed and desiccated cedars we look vainly for the snowy or azure bells of the three-petalled campanula.    From Wordnik.com.  [The Atlantic Monthly, Volume 14, No. 85, November, 1864] Reference

On the banks of a pool water-plantains had sent up stalks a yard high, branched, and each branch bearing its three-petalled flower.    From Wordnik.com.  [The Life of the Fields] Reference