HOW TO USE THE KEYS 



the genus is found to be P o p u 1 u s, and the species, by means of 

 the key on page 54, to be d e 1 1 o i d e s. 



The many differences of leaves and flowers make it impossible 

 to describe plants or construct keys without the aid of scientific terms 



1. Odd-pinnate. 2. Tendril-pinnate. 3. Even-pinnate. 



4. Palmate or digitate 5. Twice-pinnate 



VI. Compound Leaves. 



