I l<KI',> III- Mil XdK I II l-.K\ IMlKh .S I \ ll-.> :'»l 



7<i. liiuls rt)uiulc(l at I lie apex; -calcs thick; twii^.^ often 

 zigzag; plant usually with sonic thorns, not gland- 

 ular (lotted. Crataegus. (2()). 



Til. r>U(l> pointed; jdants sometimes with thorn-like 

 stunted branches, not glandular dotted. 71. 



71. lUids glabrous or slightly pubescent; twigs usually 

 glabrous and slender, some shade of black, brown, 

 or reddish, often with 2 or '\ axillar}^ buds; some 

 with self-pruning scars. Prunus. (27). 



71. liuds downy or strongly pubescent, conical, pungent; 

 twigs glabrous, mostly yellow-olive; trees with 

 erect growth, the branches not spreading as in most 

 of the apples. Pynis. (22). 



71. hmis downy or strongly pubescent; twigs strongly 

 pubescent or if glabrous then dark reddish-brown; 

 trees with rounded or spreading crowns. 



Malus. (2?.) 



71. Buds and twigs very pubescent; terminal bud with 

 long spreading scales; shrubs or small trees with 

 globose berry-like drupes containing 2-4 stones. 



Rhamnus. ( :^4 ) 

 —72— 



lUindle scars 1, or several closely united in a curved 

 line, appearing as 1. 74. 



I)undle scars more than 1 but not in an ellipse or 

 ring. 78. 



llundle scars numerous, in an elipse or ring; buds 

 small and flat or su[)erposed. pith large. ~'-\ 



Pith with ca\ities or more or less diaphragmed; axil- 

 lary buds superposed. Paulownia. (7(!). 



I'itlr solid; axillary buds small and flat, not super- 

 posed, leaf scars often in threes. Catalpa. (77). 



Twigs very green, more or less 4-angK'(l; piiii dia- 

 mond-shaped or rhomboidal. Euonymus. {X)). 



Twigs not green when ripe but gray, brown or red. 

 --ometiiues l-angled; pith cylindrical or nearly so. 

 ( •). 



Terniiiial bud absent, the twig usually ending in a 

 thorn. Rhamnus. (.U). 



Terminal bud present unle.-^> the twig is fruiting. 7t). 



