POSITION OF REPRODUCTIVE ORGANS 191 



in order to reach the nectar and must rub against the anthers 

 in leaving the flower. Thus the pollen of one flower is brought 

 to the pistil of another flower. 



FIG. 121. Moccasin flower (Cypcipedium acaule) which forces insects to 

 bring about cross-pollination because of the position of the reproductive 

 organs. 



