94 KEY TO GENERA AND SPECIES 



Fig. 176. American 

 Elm. a. Fruit, 

 b. Leaf. 



American Elm. 



143- 



Fig. 177- 



covering more than half of the nut. Nova 

 Scotia to Manitoba and southward to 

 Penn. and Tenn. Rather local in New 

 England. (Figs. 173, 174.) Bur Oak, 

 Mossy-cup Oak, Overcup Oak, Quercus 

 macrocarpa Michx. 

 Scales of the cup not awned. 

 Cup usually covering less 

 than half of the nut. Mass. 

 southward and westward. 

 "(Fig. 175.) Post Oak, Box 

 White Oak, Quercus stellata 

 Wang. 



ELM. Leaves simple, alternate, 

 with straight side veins, 

 doubly-toothed margins, 

 and an unsymmetrical base. Fruit strongly 



Fig. 178. Cork Elm. 

 a. Leaf. b. Fruit. 



