86 



in going to the flower for the nectar is dusted with pollen 

 from the later flowers. Self-pollination cannot occur. 



Snap dragon {Antirrhii.um inajus). The flowers are 

 borne in a raceme and the purple, brown and yellow corollas 

 are very conspicuous. It is pollinated by bumble bees that 

 are sufficiently strong to force the upper lip back. The 

 honey is secreted at the base of the ovary. 



This plant differs from common Toadflax in its much 

 larger flowers into which bumblebees can enter bodily, and 

 also by its firmly closed corolla which excludes the smaller 

 bees. The nectar is secreted by the smooth, green fleshy 

 base of the ovary. 



The Y &\lo\v B.dL\X\e [Bhinanthus. crista gain, L) which oc- 

 curs along the New England coast, in the mountains of New 

 Hampshire, Lake Superior region and northward sheds its 



t 



VIG. 35. 



Fig. 35. Dehiscence of anthers. 4, anthers not separated ; 5, single aather; 7. 



and 8. Pyrnla »eeunda sbowiug position of stamens and in the latter how pollen 



is shed. The dagger in each case indicates how the insect enters the flower. 



(After Kerner von Marilaun.) 



pollen in an interesting way on the insect's head. ''Each 



