Black Walnut 



a. Winter twig, x 2/^. 



b. Leaf, x i/^. 



c. Fruit, X I/3. 



d. Section of twig showing diaphragms. 



Butternut 



a. Winter twig, x 2/^ 



b. Leaf, x i/^. 



c. Fruit, X 1/3. 



[136] 



