Q. macrocárpa.
3. Quércus macrocárpa, Michx. (Bur-oak. Mossy-cup.) Leaves obovate or oblong, lyrately pinnatifid or deeply sinuate-lobed or nearly parted, the lobes sparingly and obtusely toothed or entire. Acorn broadly ovoid, 1 in. or more long, one half to almost entirely inclosed in a thick and woody cup with usually a mossy fringed border formed of the upper awned scales; cup very variable in size, ¾ to 2 in. across. A handsome, middle-sized tree, 40 to 60 ft. high. Western New England to Wisconsin, and southwestward.
Q. lyràta.
4. Quércus lyràta, Walt. (Swamp Post-oak.) Leaves crowded at the ends of the branchlets, very variable, obovate-oblong, more or less deeply 7- to 9-lobed, white-to-mentose beneath when young, becoming smoothish; the lobes triangular to oblong, acute or obtuse, entire or sparingly toothed. Acorn about ¾ in. long, nearly covered by the round, ovate, thin, rugged, scaly cup. A large tree with pale flaky bark. River-swamps in southern Indiana to Wisconsin, and southward.
Q. bícolor.
5. Quércus bícolor, Willd. (Swamp White Oak.) Leaves obovate or oblong-obovate, wedge-shaped at base, coarsely sinuate-crenate, and often rather pinnatifid than toothed, whitish, soft-downy beneath. Main primary veins 6 to 8 pairs. Acorns, nearly 1 in., oblong-ovoid, set in a shallow cup often mossy fringed at the margin, on a peduncle about as long as the acorn, much longer than the petioles of the leaves; in the axils of the leaves of the year. A large tree, 60 to 80 ft. high, stem 5 to 8 ft. in diameter. Most common in the Northern and Western States, in swamps, but found in moist soil in the mountains of the South.
