96 KEY TO GENERA AND SPECIES 



less than 18 pairs. Throughout our range. 

 (Figs. 176, 177.) American Elm, White 

 Elm, Elm, Ulmus americana L. 



Fig. 180. Slippery Elm. a. Leaf. b. Fruit. 



Fig. 181. Slippery Elm. Old Tree. 



145. Mature fruit more than | inch long, slightly 

 hairy all over. Side veins of the leaf usually 



