THE ELMS AND HACKBERRIES 

 1. GENUS ULMUS, LINN. 



TREES of horticultural and lumber value. Leaves alternate 

 serrate, unequal at base, with strong ribs and short petioles. 

 Flowers greenish, inconspicuous, perfect. Fruit a dry nutlet 

 with thin encircling wing, bearing two hooks at apex. 



KEY TO SPEdES 



A. Blooming before the leaves in spring. 

 B. Twigs smooth. 



C. Branches corky winged. 



(U. alata) WAHOO OB WINGED ELM 

 CC. Branches not corky winged. 



(U. Americana) AMERICAN OR WATER ELM 

 BB. Twigs pubescent. 



C. Branches corky. (U. Thomasi) CORK ELM 



CC. Branches not corky; leaves rough above; twigs 

 and buds with coarse, rusty hairs. 



(U. fulva) SLIPPERY ELM 



