THE FLOWER. 



25 



These catkins grow upon different trees ; so the wil- 

 low from which they were taken is dioecious. 



FIG. 17. 



FIG. 18. 



Pistillate Flower, from 

 Catkin (Fig. 18). 



FIG. 19. 



Female Catkin of a Dioecious Plant. 

 Fia. 20. 



Male Catkin of a Dioecious Plant. 



Staminate 



Flower, from 



Catkin (Fig. 19). 



