A Bud and Twig Key 



}?2. Twigs slender glabrous lustrous 

 brown growing darker in second 

 year, buds one-eighth inch long 

 gradually tapered to acute apex 

 light brown glabrous or often mi- 

 nutely pubescent. 



O. palustris Muenchh. 

 g2. Buds one-fourth inch or longer. 



hi. Twig conspicuously densely hairy light 



brown stout, 'becoming glabrous bright 



reddish in the second year, buds acute 



one-third to one-half inch long covered 



with a dense coat of light rusty tomentum. 



O. garryana Dough 



Ii2. Twigs glabrous. 



77. Buds prominently angled acute one- 

 fourth inch long covered with rusty 

 brown hairs, twigs stout light to dark 

 brown becoming darker or ashy gray 

 the second year. 



Q. marilandica Muenchh. 



12. Buds covered with light gray pubes- 

 cence, one-fourth to one-half inch long, 

 gradually taper to obtuse apex, strongly 

 angled, twigs stout dull red-brown be- 

 coming darker in second year, pith yel- 

 low. Plate V. Q. velntma Lam. 



i?. Buds glabrous or only partially pubes- 

 cent. 



ji. Bud-scales with scarious margins, 

 minutely pubescent, scales of inner 

 ranks tomentose on outer surface, 

 buds broadly ovate or oval acute one- 

 fourth inch long, twigs bright red or 

 yellowish brown becoming ashy gray 

 in the second year. 



Q. michau.rii Nutt. 



