ECOLOGY OF FLOWERS 



371 



case the closed flowers are much less conspicuous than 

 the others, yet they produce much seed. Every one 

 knows the ordinary flowers of the violet, but most people 



FIG. '2G2. Protection of Pollen from Moisture. 



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

 the same flowers during rain. 



do not know that violets very generally, after the blos- 

 soming season (of their showy flowers) is over, produce 

 many cleistogamous flowers, as shown in Fig. 261. 



