FLOWERS 



185 



these pollen sacs split open for the casting of pollen ? Draw 

 two stamens, one with open and the other with closed anther. 



Can you find anything resembling calyx and corolla ? 



What can you say of the size of pollen grains ? 



FIG. 79. Corsican pine : a, pistillate flower ; b, pistillate cones one year old ; 

 c, pistillate cone two years old ; d, staminate cones. 



(6) The female flower. Examine the cone and note the 

 shape, size, color, and arrangement of the scales. 



Why do the outstanding edges of scales project as they do? 



