EFFECT OF INSECTS ON FLOWERS. 



13 



Among other obvious evidences that the beauty of 

 flowers is useful in consequence of its attracting insects, 

 we may adduce those cases in which the transference of 



FIG. 7. Malva sylvestris. 



FIG. 8. Malva rotundifolia. 



the pollen is effected in different manners in nearly 

 allied plants, sometimes even in the same genus. 



Thus, as Dr. H. Muller has pointed out, Malva sylves- 

 tris (Fig. 7) and Malva rotundifolia (Fig. 8) which grow 



FIG. 9. Stamens and stigmas of Malva 

 sylvestris. 



FIG. 10. Ditto of Malva rotundifolia. 



in the same localities, and therefore must come into 

 competition, are nevertheless nearly equally common. 



In Malva sylvestris, however (Fig. 9), where the 

 branches of the stigma are so arranged that the plant 



