18 
110. 
iD, 
I12. 
Tag. 
14. 
TREES. 
Flowers showy, 
Flowers in catkins. ITT. 
Sap milky: leaves broad. 
Sap not milky: leaves rather narrow. 
Compound, 
Pith large: fruit a small berry. 
Pith moderate. 113. 
Leaflets at most finely toothed. 114. 
Leaflets often coarsely toothed or lobed. 
Leaf-scars encircling the buds. 
Leaf-scars not encircling the buds, 
Lagerstroemia. 
Broussonetia. 
Salix. 
Sambucus. 
Acer (Negundo). 
Phellodendron. 
Fraxinus. 
