Michigan Trees: A Handbook of the Native and Most Important Introduced Species
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 _Q. bicolor_, p. 105.
bb. Margin of leaf coarsely toothed; acorns sessile or on stalks less than 1/2 inch long. _Q. muhlenbergii_, p. 107.
+WINTER KEY TO THE SPECIES OF QUERCUS+
a. Terminal buds usually about 1/8 inch long.
b. Twigs thick-tomentose; entire bud pale-pubescent; branches corky-ridged; cup of acorn conspicuously fringed at the rim. [1][G] _Q. macrocarpa_, p. 103.
bb. Twigs glabrous; buds glabrous, or only slightly or partially pubescent; branches without corky ridges; cup of acorn not conspicuously fringed at the rim.