A Bud and Twig Key 71 



02- Buds one-fourth inch or longer. 



///. 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. 



Q. garryana Dougl. 



1i2. Twigs glabrous. 



11. 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 

 yellow. 



Q. velutina Lam. 



?j. Buds glabrous or only partially pubes- 

 cent. 



//. 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. michan.i'ii Nutt. 



J2. Bud 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. prinus Linn. 



k2. 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. 



Q. rubra Linn. 



