78 



PLAKT RELATIONS. 



Fig. 70. An alpine willow, showing a strong rootstock developing aerial branches 

 and roots, and capable of long life and extensive migration.— After Schimper. 



itself into such relations that it may secure pollination. 



Besides pollination, 

 wliich is nei.'essa.rv 

 to the production of 

 seeds, there must be 

 an arrangement for 

 seed distribution. 

 It is ahvay.s well for 

 seeds to be scattered, 

 so as to be separated 

 from one another 

 and from the parent 

 plant. The two 



X. ~, . <, , u ■ i, , , , great external prob- 



Fifi. 71. A flower of peony, showing the four sets of ^ _ ^ _ 



floral organs: A, the sepals, together called the lems in connection 



calyx ; o, the petals, together called the coi'olla ; w i t b t li e flower 

 ti, the numerous stamens ; g, the two carpels, 



which contain the ovules. — After Strasburger. tjiereiore, ai'e po/ll- 



