THE FLOWER. 
125 
When staminate and pistillate flowers grow upon 
separate plants, such plants are said to be dioecious. 
Fig. 216 represents a pistillate flower from the female 
catkin (Fig. 217). Fig. 219 represents a staminate 
Fig. 219. 
Staminate Flower, from 
Catkin (Fig. 218). 
flower from the male catkin (Fig. 218). These cat¬ 
kins grow upon different trees; so the willow from 
which they were taken is dioecious . 
When staminate, pistillate, and perfect flowers are 
all found upon the same plant, it is polygamous . 
Point out upon the charts examples of monoecious, 
dioecious, and polygamous plants. 
Let the pupil answer the following questions con¬ 
cerning each flower of his collection: Is your flower 
symmetrical or unsymmetrical ? Is it complete or 
incomplete ? Is it dichlamydeous, monoehlamydeous, 
or achlamydeous ? Is it perfect or imperfect? Did 
it grow upon a monoecious, dioecious, or polygamous 
plant ? 
