38 Trees with Simple Leaves. [An 



Fig. 18. Common Thorn, Dotted-fruited Thorn. C. punctata, 



Jac. 



Leaves, SIMPLE ; ALTERNATE ; EDGE UNEVENLY SHARP- 

 TOOTHED ABOVE THE MIDDLE ; sometimes, toward the 

 apex deeply cut. 



Outline, reverse egg-shape. Apex, usually slightly pointed. 

 Base, strongly wedge-shape, tapering from above the 

 middle of the leaf and along the leaf-stem to a point. 



Leaf-stem, one half to one inch long, slender, and winged 

 by the tapering leaf. 



Leaf, one and a half to two and a half inches long ; about as 

 wide ; light green ; rather thick ; downy when young ; 

 when mature, smooth and dull, or sometimes hairy 

 below, especially on the ribs. Ribs, very straight 

 below ; above, marked by deep furrows. Thorns, one 

 to two inches long, stout and curved, or often wanting. 



Bark, rough. 



Flowers, white ; eight to fifteen in somewhat leafy bun- 

 ches. May. 



Fruit, about one half inch in diameter, or more ; usually 

 dull red or yellow, with whitish dots ; round ; some- 

 what edible. September. 



Found, from New Brunswick and Vermont southward 



and westward. 

 A thick, wide-spreading tree, twelve to twenty-five 



feet high. 



Fig. 19. Cockspur Thorn. C. crus-galli, L. 



Leaves, SIMPLE ; ALTERNATE ; EDGE, SHARPLY TOOTHED 



ABOVE ; ENTIRE BELOW. 



Outline, reverse egg-shape. Apex, usually rounded, 

 sometimes pointed. Base, tapering to a point, quite 

 variable. 



Leaf-stem, short. 



