ee. Upper surface of leaves usually dull; lowermost 
branches of trees growing in the open not drooping; 
nut about I inch long.............. Q. rubra, p. 109. 
bb. Leaf-lobes rounded, not bristle-tipped; fruit maturing 
in the first season. 
c. Leaves cut nearly to the midrib by a pair of deep sinuses 
near the middle of the leaf; branches corky-ridged; nut 
44-1% inches long, deeply seated in a large, conspic- 
uously fringed cup............... Q. macrocarpa, p. 103. 
ce. Leaves not cut by a pair of deep sinuses; branches not 
corky-ridged; nut about 34 inch long, about one-fourth 
covered by a thin, tomentose, warty cup..Q. alba, p. tot. 
aa. Leaves not deeply cut nor lobed. 
b. Margin of leaf entire to sinuate-crenate, but not toothed; 
acorns on stalks 14-4 inches long. 
c. Margin of leaf entire, or only slightly undulate; acorns 
on peduncles % inch long, the nut about %4 inch long; 
bark on branches not breaking into large, papery scales 
iia koiicaanietambsaecda annie. Q. imbricaria, p. 121. 
cc. Margin of leaf sinuate-crenate, rarely lobed; acorns on 
stems 1-4 inches long, the nut about 1 inch long; bark 
on branches breaking into large, papery scales which 
Curl “back: c2xtkna dan grded soedwarens J Q. bicolor, p. 105. 
bb. Margin of leaf coarsely toothed; acorns sessile or on 
stalks less than % inch long...... Q. muhlenbergti, p. 107. 
— 7 
