IN THEIR WINTER CONDITION. 



'< 



Buds not clustered. 



Scales gummy; stipule-scars present. 



Populus. 4<> 



Scales not gummy, no stipule-scars. „. M 4 , 



Pith cylindrical. 



gTwigs pubescent, at least at apex. 



Pith diaphragmed Juglans. 40 



Pith homogeneous. 



B rown Ailanthus. ~> 



White. 



Leaf-scars V-shaped Pyius. 26 



Leaf-scars heart-shaped. . . .Sapindus. 14 

 Leaf-scars small, semi-oval. 



Scales obscure, cottony-villous. 



Ceanothus. 9 



Scales apparent, glabrescent. 

 Amorpha. 18 



gSTwigs glabrous. 



^[Stipule-scars present. 



Extending around twig 1 latanus. <sa 



Not extending around twig. 

 Buds superposed. 



Leaf-scars semi-oval Amorpha. 18 



Leaf-scars U-shaped Gleditsia. 22 



Buds single. 



Scale one balix. 4o 



Scales several. 



Bundle-scar 1 ; twigs gray . . Rhamnus. 8 

 Bundle-scars 3; twigs dark. 



Leaf-scars V-shaped Pyrus. 26 



Leaf -scars oval Primus. 23 



ifflStipule-scars absent. 



Terminal bud absent Gymnocladus. 21 



Terminal bud present Hicoria. 41 



