- / Hud and 7\v/>/ Key 69 



J2. Bud-scales firmly imbricated. 



gi. Buds less than one-fourth inch long. 

 hi. I>uds covered with pubescence. 



11. Branchlets two years old covered with 

 soft pale pubescence, twigs stout light 

 brown becoming darker the second year, 

 buds brown broadly ovate obtuse about 

 one-eighth inch long. 



Q. minor (Marsh.) Sargent 



12. Branchlets two years old glabrous. 



ji> Twigs slender light yellowish brown 

 slightly pubescent becoming lighter 

 colored in second year, buds acute 

 scarcely one-fourth inch long. 



Q. lobata Nee. 



//. Twigs slender light yellowish-brown, 

 or minutely pubescent growing darker 

 or ashy gray in second year, buds ob- 

 tuse or acute one-eighth inch long 

 light brown. Q. gambclii Nutt. 



/j. Twigs stout light yellowish glabrous 

 becoming ashy gray or light brown in 

 second year, corky wings on branch- 

 let usually appear second or third 

 year, buds broadly ovate, acute or ob- 

 tuse one-eighth to one-quarter inch 

 long. Q. macrocarpa Michx. 



h2. Buds glabrous or slightly or partially 



pubescent. 

 ii. Buds obtuse. 



/i. Bark on branches one inch in diameter 

 breaks into stiff papery sheets, twigs 



f 



O 



Quercus alba Qufrcus rubra Quercus velvtina Betula papyri fera 



L Leaf-scar magnified. 

 C Cross-section of twig. 



