434 



POLLINATION OF FLOWERS 



they produce much seed. Every one knows the ordinary flowers 

 of the violet, but most people do not know that violets very gen- 

 erally, after the blossoming season (of their showy flowers) is 

 over, produce many cleistogamous flowers, as shown in Fig. 334. 



EM: 



FIG. 335. Protection of pollen from moisture 



At the left herb Robert and sweet scabious in sunny weather; at the right the 



same flowers during rain. After Keruer 



409. Protection of pollen from rain. Pollen is very generally 

 protected from being soaked and spoiled by rain or dew by the 

 natural position of the flower, which prevents rain from entering, 

 as in the case of most sympetalous, nodding flowers, such as the 



