The Trees of Vermont IT 



jf. Branches not armed. 



g. Base of leaves decidedly oblique. 



h. Leaf-blades about as long as they are broad, heart- 

 shaped ; fruit globose, woody, ripe in autumn, 



Tilia, p. 181. 



hh. Leaf-blades l>^-2 times as long as they are broad, 



oval to ovate ; fruit a membranaceous samara, ripe 



in spring Ulmus, p. 129. 



■ gg. Base of leaves essentially symmetrical. 

 h. Teeth coarse, 2-5 per inch of margin. 



i. Leaves very glabrous both sides ; fruit a prickly 

 bur. 



;. Leaves 3-5 inches long, very lustrous beneath ; 

 bark close, smooth, steel-gray .. Fagus, p. 107. 

 //. Leaves 6-8 inches long, not lustrous beneath ; 

 bark fissured, brownish. . . .Castanea, p. 108. 

 a. Leaves pubescent or white-tomentose, at least 

 beneath ; fruit not a prickly bur. 

 /. Leaves 2-4 inches long, broadly ovate to sub- 

 orbicular ; fruit a very small capsule, falling in 



spring Populus, p. 60. 



ij. Leaves 4-7 inches long, oblong-lanceolate to 

 obovate ; fruit an acorn, f alHng in autumn, 



Quercus, p. 112. 

 hh. Teeth fine, 6-many per inch of margin. 



i. Leaf-petioles laterally compressed ; leaves tremu- 

 lous Populus, p. 60. 



a. Leaf-petioles terete ; leaves not tremulous. 



y. Leaf-blades at least 3 times as long as they arc 

 broad. 

 k. Twigs brittle; fruit a very small capsule, 



falling in spring Salix, p. 55. 



kk. Twigs tough ; fruit a fleshy drupe, falling in 

 late summer or autumn. . . .Prunus, p. 149. 

 jj. Leaf-blades not more than twice as long as 

 they are broad. 



k. Leaf-blades about twice as long as they are 

 broad. 



/. Margin of leaves singly serrate; fruit 

 fleshy. 



