THE BEHAVIOUR OF FLOWERS 159 
the rim of the urn-shaped corolla ? Five, you say, and 
you have read that each one of these represents a petal, 
and that all the petals are joined together by their edges. 
The sepals. Below the corolla you see five green 
pointed leat-like parts arranged in the form of a crown. 
What does each one of these parts represent ? 
The stamens and pistils. Now 



LA 

Fic. 194, Marrow vine with pistil flower. 
look down in the bottom of 
the flower for the stamens. 
All the flowers are not alike, you see. There is a column 
in the centre of each. On some of these there is pollen. 
These columns in some of the flowers are different from 
the columns in others. Are the flowers all alike on the 
outside? No! Those with the three blunt projections 
on the end of the column have a round enlargement on 
the flower stalk. In the other flowers there is no 
enlargement on the flower stalk, and the column of 
these bears pollen grains. So these columns must be 
- $$$. $$ 

