190 LIFE STORIES OF PLANTS 
buttercup. This is what gives the peculiar form to 
the pea flower. 
Now all these parts, or the different kinds of petals 
of the pea flower, have received names. I should not 
be surprised if, after studying their shapes carefully 
and their position in the flower, you could name them 
yourself, especially if 
you tried to think of 
things with which 
you are familiar and 
which these petals 
resemble. 
Now, first, the 
_/ large one, held up 
~ above, is the standard. 
The two reaching 
out on the sides are 
wings. Now think 
hard for the two below, folded up together. Did you 
ever make or sail a boat? What does the boat have on 
the underside that cuts through the water? The keel. 
Standard, wings, keel, —these are the petals of the pea 
flower and all together we call them the corolla. 
Now remove the petals from the flower. Place them 
out in position and draw the form. The two parts 
which form the keel are joined in the middle. Is that 
the case with the keel in the garden pea? 

Fig. 230. Petals of sweet pea. 
