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THE FIRST BOOK OF BOTANY. 
upper, Fig. 175) is called the banner; the two side 
ones are called wings , and the lower ones the keel. 
Fig. 178. Fig. 179. 
Learn to distinguish the banner, wings, and keel 
of papilionaceous corollas, and note the differences of 
their forms in different kinds of flowers. You can 
write such observations as these upon the back of the 
schedule. Do not hurry along to new lessons while 
the forms of corollas shown in this and the follow¬ 
ing exercises are strange to you. Gather all sorts of 
flowers and describe them carefully. 
There are many other varieties of polypetalous 
