The Trees of Vermont 19 



gg. Leaf -lobes sinuate-toothed to serrate; leaves not 

 lustrous above, their petioles 1-2 inches long. 

 h. Leaf-lobes coarsely sinuate-toothed ; winter-buds 

 forming in summer within the petiole of the leaf, 



Platanus, p. 1-11 

 hh. Leaf-lobes serrate; winter-buds not forming in 

 summer within the petiole of the leaf. 

 i. Branches armed with stiff, sharp thorns ; sap not 



milky Crataegus, p. 147. 



ii. Branches unarmed; sap milky,. . .Morus, p. 137. 



cc. Leaves opposite Acer, p. 162. 



aa. Leaves compound. 

 /;. Leaves alternate. 



c. Branchlets armed with short, sharp prickles. , Robinia, p. 159. 

 cc. Branchlets unarmed. 



d. Upper leaflets less than 1 inch broad ; fruit berry-like, J4 



inch in diameter Pyrus, p. 143. 



dd. Upper leaflets 1-5 inches broad; fruit a nut an inch or more 

 in diameter. 



e. Leaflets 5-11 ; pith homogeneous Carya, p. 83. 



ec. Leaflets 11-23 ; pith chambered Juglans, p. 77. 



hb. Leaves opposite. 



c. Leaves pinnately compound ; fruit a samara. 



d. Leaflets 3-5 ; samaras paired Acer, p. 162. 



dd. Leaflets 7-11, exceptionally 5 ; samaras not paired, 



Fraxinus, p. 185. 

 c. Leaves digitately comj^ound ; fruit a prickly bur, 



Aesculus, p. 179. 



