65 



40. 

 40. 



Leaves with entire margins ............................................................... 41 



Leaves with toothed margins ........................... , ................................... 44 



Page. 



41. 



Leaves even-pinnate, .......................... Gleditsia and Gymnooladus in Leguminosae 



Leaves odd-pinnate ............................................................................ 42 



177 



42. 

 42. 



Leaflets small, elliptic; twigs thorny, ........................... Robinia in Leguminosae 



Leaflets large, ovate; twigs not thorny .................................................... 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. 

 45. 



Large trees; stamina te flowers in aments; fruit a nut, .................. Juglandaceae 



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 



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



Rhus typhina and R. glabra in Anacardiaceae 



173 



TABULATION OF GENERA AND SPECIES. 



5 



