50 KEY FOR THE IDENTIFICATION OF TREES AND SHRUBS 



trunk, acorn cup 

 small, shallow, 

 saucer- shaped. 

 Pin Oak 



Quercus palustrts Muench. 

 37. Leaf with a lobe on one side only: 

 a mitt en- shaped leaf. There are 

 often symmetrical leaves, with- 

 out lobes or with 2 lateral lobes 



on the same branch 38 



37. Base of leaf rounded on one side 



and obliquely cut on the other . 39 

 38. Leaf aromatic, margin entire. 

 Sassafras 



Sassafras varit folium 

 (Salisb. ) Ktze. 

 38. Leaf not aromatic, margin ir- 

 regularly toothed, upper sur- 

 face shining, rough, sap milky. 

 White Mulberry 

 Morus al ba L. 

 39. Leaf elliptic, doubly serrate, 

 sharp-pointed. 



Genus Ulmus 40 



39. Leaf broad-ovate to orbicu- 

 lar, serrate, sharp-pointed, 

 under surface hairy in tufts 

 at angles of the veins. 



Genus Till a 42 



40. Leaf broadest near the mid- 

 dle 41 



40.Leaf broadest just below 

 the tip. 



Scotch Elm 

 Ulmus glabra Huds . 

 41. Leaf 2-3 inches long, 

 surface rough. 

 White Elm 

 Ulmus americana L. 

 41. Leaf less than 2 in- 

 ches long, surface 

 smooth, branches 

 slender and drooping. 

 Chinese Elm 

 Ulmus pumt la L. 



