62 The New York State College of Forestry 



LEAF KEY TO THE SPECIES — (Continued) page 



165. Leaves 8 inches to 3 feet long 167 



166. Leaflets oblong to oblong-lanceolate, blunt or acute at the apex 



Pyrus Aucuparia 239 



166. Leaflets lanceolate, acuminate at the apex Pyrus americana 237 



167. Leaflets entire except for a few coarse teeth toward the base, short stalked . . 



Ailanthus glandulosa 277 

 107. Leaflets sharply serrate at least toward the apex, sessile or sub-sessile. . . . 168 



168. Leaf-rachis glabrous Rhus glabra 281 



168. Leaf-rachis pubescent 169 



169. Leaflets pubescent beneath ; 10 



169. Leaflets glabrous or puberulous beneath Rhus typhina 279 



170. Leaflets 13-23, lustrous above, 1-1 j inches wide Juglans nigra 143 



170. Leaflets 11-17, rugose above, 1^-2 inches wide Juglans cinerea 141 



171. Leaves 6-8 inches long; leaflets less than 1 inch in length 



Gleditsia triacanthos 269 



171. Leaves 1-4 feet long; leaflets 1 inch or more in length 172 



172. Leaflets ovate to oval, entire Gymnocladus dioica 267 



172. Leaflets broadly ovate to lanceolate, finely serrate Aralia spinosa 313 



