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 



