The Flower. 
ao 
tils (Fig. 47) of the pea are also quite different in form 
from those of the cherry. 
The variety of form in the parts 
of the flowers of different species is almost infinite. 
147. 
Certain Parts of the Flower are often Wanting. 
The flowers of the maple have no corolla; those of the wil- 
low have neither calyx nor 
corolla; certain flowers of 
the pumpkin, Indian corn 
and many other plants have 
no stamens, while other flow- 
ers of the same species have 
no pistils (154). In many 
varieties of the American 
plum (Prunus Americana) the 
pistil is often wanting. 
148. Composite (com- 
pos’-ite) Flowers* are made 
up of several individual flow- 
Fie. 48. Cross section of flower-head of sunflower, 
Helianthus annuus. 
Fig. 46 Fig, 47. 
Fig. 46. Stamens (st) and pistils of 
the pea, Pisum sativum. 
Fig. 47. Pistil of same alone. (After 
Baillon). 
ers in the same flow- 
er-head. The sun- 
flower (Fig. 48) is a 
familiar example of 
a composite flower. 
One of the separate 
flowers is shown in 
Fig. 49. At the 
outer edge of the 
flower head, is a row 
of individual flow- 
ers, each of which 
Reduced. The florets appear 
closely crowded in the center of the head. 
* The plants having composite flowers form an extensive family in botany called 
Composite. 
