A Bud and Twig Key 17 



J2. Bucl-scales without scarious margins. 



ki. Twig light brown stout becoming 

 dark gray or brown in the second 

 year, buds acute or acuminate one- 

 fourth to one-half inch long and 

 narrow in proportion, scales light 

 brown with ciliate margins. 



Q. primts Linn. 



J?2. Twig dark red brown slender re- 

 maining about the same the second 

 year, buds taper gradually to acute 

 apex, one- fourth inch long light 

 brown glabrous. Plate V. 



Q. rubra Linn. 



Quercus velutina 



Betulq papyrifera 



PLATE V. 



L Leaf -scar magnified. 

 C Cross-section of twig. 



e2. Buds solitary at end of twig. 



/i. Buds long narrow appressed, one cap-like 

 scale glabrous or pubescent, bundle-scars three 

 in a narrow lunate leaf-scar, stipule-scars 

 usually distinct, twigs slender, no terminal bud, 

 tip-scar often prominent. Salix Linn. 



