370 FOUNDATIONS OF BOTANY 
cross-pollinated. Usually they occur on plants which 
also bear flowers adapted for cross-pollination, and in this 
Fic. 261.— A Violet, with Cleistogamous Flowers. 
The objects 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 ordi- 
nary flowers have disappeared. 
