182 FLOWERS 



Exercise 



Procure a water lily, or a double tulip or rose, and care- 

 fully remove a part from each circle, laying the parts 

 removed down in the order of their removal. Note how, as 

 you proceed toward the center, the parts seem to change in 

 shape. Do you find petals with anthers or stamens which 

 are spreading out to form petal-like organs ? 



Suggestion. Place the series of floral organs in a book 

 and press them until thoroughly dry. Then mount them 

 on a card, cover them with glass, and passe partout them with 

 paper. Compare this series with similar ones of bud scales. 

 What is the inference from these form studies ? 



163. SEX ORGANS OF FLOWERS 



Object. To learn something about the reproductive 

 organs of plants. 



Apparatus. Any large perfect flower, such as tulip, Easter lily, 

 wild crane's-bill, evening primrose, or hollyhock. If smaller flowers 

 must be used, a simple magnifier will be necessary. 



Method. Remove the outer floral circles (calyx and 

 corolla) and study what remains. 



(a) Stamens. Remove a stamen from a fresh flower and 

 examine it. Of how many parts is it composed? Describe 

 it. Draw. Look for fine powder on the anther. This is 

 pollen. The stamen is the male part of a plant. Pollen 

 is the male or fecundating substance of the flowering plant. 



(6) Pistils. Examine the organ which stands exactly 

 in the center of the flower. This is the pistil. Of how many 

 parts does a pistil consist? Some flowers have more than 

 one pistil. How many are found in the flower studied? 

 Draw a pistil, naming its parts ovary, style, stigma. 



