THE COLOURS OF FLOWERS. 



our British species, Lobelia Dortmanna, is sky-blue ; 

 the other, L. urens, is a dingy purple. Not far from 

 them are the Dipsacece, including the lilac scabious, 

 the blue devil's bit, and the mauve teasel. Amongst 



FIG. 16. Flower of harebell (Campanula); bright blue. 



all these very highly- evolved groups blue distinctly 

 forms the prevalent colour. 



In the great family of the Ericacece, or heaths, which 

 is highly adapted to insect fertilisation, more particu- 

 larly by bees, purple and rose are the prevailing tints, 



