172 WILD FLOWER PRESERVATION 



Flowers that require the services of small 

 flies are generally flatly open, and when they 

 secrete honey it is not far to seek. (83) 



The secretion of honey is a great attraction 

 in insect-fertilized flowers; but many plants 

 possessing no honey are visited for the sake 

 of their pollen, some of which is eaten, some 

 stored, and some dropped on to the stigmas 

 of other flowers. 



The Stigma. The stigmas of insect-fertil- 

 ized flowers are variously shaped, but they are 

 more or less smooth and sticky. (84) 



Pollen. The pollen is often heavier and 

 moister than that of wind-fertilized flowers. 

 When magnified it is also seen to be rough and 

 spiky, so that it may easily stick to the hairy 

 bodies of insects and later adhere to the sticky 

 surface of the stigmas. Pollen-grains (both 

 greatly magnified.) (85) 



WIND-FERTILIZED FLOWERS. 



The Corolla. This is usually small, incon- 

 spicuously colored and without scent or en- 

 tirely absent. (86) 



Such flowers frequently bloom before the 



