40. Leaves with entire margins, 41 



40. Leaves with toothed margins 44 



41. Leaves even-pinnate, Gleditsia and Gymnocladus in Leguminosae 



41. Leaves odd-pinnate, 42 



Page. 



177 



42. Leaflets small, elliptic; twigs thorny, . 

 42. Leaflets large, ovate; twigs not thorny, 



Robinia in Leg-uminosae 

 43 



181 



43. Leaflets 7-21, not toothed at base, without glands, 



Rhus Vernix and R. copallina in Anacardiaceae 183 



43. Leaflets 11-41, sometimes with 2-4 blunt teeth at base which have glands on lower 



side at the point of each tooth, Simarubaceae 187 



44. Twigs and leaves prickly; leaves twice or thrice compound Araliaceae 199 



44. Twigs and leaves not prickly; leaves once compound 45 



45. Large trees; staminate flowers in aments; fruit a nut, Juglandaceae 



45. Small trees; staminate flowers not in aments; fruit red and fleshy, 46 



100 



46. Leaflets 13-15; sap not milky; branches heavy-tipped, 



Pyrus americana in Rosaceae 173 



46. Leaflets 11-31; sap milky; branches heavy-tipped, 



Rhus typhina and R. glabra in Anacardiaceae 183 



TABULATION OP GENERA AND SPECIES. 



