DDDD. Seeds bom? in 2-valved pods, on long catkins; minute, in cottony floats 



E. Leaves narrow; twigs supple The Willowy 



EE. Leaves broad; twigs stiff, angular The Poplars 

 AA. Leaves compound 



B. Fruit, a flat pod The Locusts 

 BB. Fruit, a nut 



C. Husk opening when ripe by 4 valves The Hickories 



CC. Husk not opening when ripe The Walnuts 



