100 



Leaves sinuate dentate, sometimes lobed near the 

 base, velvety to the touch beneath; peduncles 



of fruit longer than the peticles 2 Q. bicolor. 



Leaves irregularly lobed, harsh or rarely velvety or 

 smooth to the touch beneath; peduncles of fruit 

 shorter than the petioles. 



Cup of fruit fringed; apex of lobes of leaves gener- 

 ally rounded; trees of lowland 7 Q. macrocarpa 



Cup of fruit not fringed; apex of lobes of leaves 

 generally acute; trees of swamps in the ex- 

 treme southwestern counties of Indiana 8 Q. lyrata. 



Bark dark, tight and furrowed; leaves with bristle tips; fruit 

 maturing the second year. 



Leaves entire 9 Q. imbricaria. 



Leaves more or less deeply lobed, the lobes and teeth con- 

 spicuously bristle pointed . 

 Mature leaves smooth beneath, except tufts of hairs in 



the axils. 



Leaves lobed to about the middle, the lateral lobes 

 broadest at the base; cup saucer-shaped; nut about 

 1.5-2 cm. in diameter; terminal buds reddish. 10 Q. rubra. 

 Leaves lobed to beyond the mid'dle, frequently those 

 grown in dense shade not so deeply lobed, some or 

 all of the lateral lobes broadest toward the apex. 

 Cup saucer-shaped, rarely enclosing the nut for 

 more than % its length; trees of the low lands 

 and swamps. 



Leaves glossy above; blades usually 10-12 cm. long; 

 cups usually 1.5 cm. or less broad; terminal 



buds chestnut brown . . 11 Q. palustris. 



Leaves dull above, usually about 15 cm. long; cups 

 1.5-2.5 cm. broad, rarely as narrow as 1.5 cm.; 



terminal buds grayish brown 12 Q. Sehneckii. 



Cup hemispheric, generally enclosing the nut for 



half its length; trees of the uplands. 

 Inner bark yellowish or orange; kernel of nut 



yellowish or orange, and very bitter. 

 Terminal buds usually 5 mm. or less in length, 

 ovoid and generally blunt, reddish-brown; 

 scales of cup closely appressed; trees local 

 in the extreme northwest part of the State. 13 Q. ellipsoidalis. 

 Terminal buds usually longer than 6 mm. , usually 

 angled and sharp-pointed; scales of cup not 

 closely appressed; trees of all parts of the 



State 14 Q. velutina. 



Inner bark reddish or gray; kernel white and not 



very bitter 15 Q. coccinea. 



Mature leaves more or less pubescent on the whole under 

 surface. 



