CLEISTOGAMOUS FLOWERS 



433 



cleistogamous (meaning with shut-in fertilization) and are of 

 course not cross-pollinated. Usually they occur on plants which 

 also bear flowers adapted for cross pollination, and in this case 

 the closed flowers are much less conspicuous than the others, yet 



FIG. 334. A violet, with cleistogamous flowers 



The structures which look like flower buds are cleistogamous flowers in various 

 stages of development. The pods are the fruit of similar flowers. The plant 

 is represented as it appears in late July or August, after the ordinary flowers 

 have disappeared 



