PLANT STUDIES 
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, 
which is necessary 
to the production of 
seeds, there must be 
an arrangement for 
seed distribution. 
It is always well for 
seeds to be scattered, 
so as to be separated 
from one another 
and from the parent 
plant. The two 
great external prob- 
FIG. 71. A flower of peony, showing the four sets of - 1 
floral organs : k, the sepals, together called the lems in Connection 
calyx ; c, the petals, together called the corolla ; with the flower 
a, the numerous stamens ; g, the two carpels, / 
which contain the ovules.-After STRASBURGER. therefore, are polll- 
