Wang. (POST-OAK. ROUGH OR BOX WHITE OAK.) Leaves
4 to 6 in. long, sinuately cut into 5 to 7 roundish, divergent lobes,
the upper ones much larger and often 1- to 3-notched, grayish-or
yellowish-downy beneath, and pale and rough above. Acorn ovoid, about
1/2 in. long, one third to one half inclosed in a deep, saucer-shaped
cup; in the axils of the leaves of the year. A medium-sized tree, 40 to
50 ft. high, with very hard, durable wood, resembling that of the White
Oak. Massachusetts, south and west.

[Illustration: Q. macrocarpa.]

3. =Quercus macrocarpa=, 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, 3/4 to 2 in. across. A handsome,
middle-sized tree, 40 to 60 ft. high. Western New England to Wisconsin,
and southwestward.

[Illustration: Q. lyrata.]

4. =Quercus lyrata=, 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 3/4 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.

[Illustration: Q. bicolor.]

5. =Quercus bicolor=, 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.

[Illustration: Q. Michauxii.]

6. =Quercus Michauxii=, Nutt. (BASKET-OAK or COW-OAK.) Leaves 5 to 6 in.
long, oval to obovate, acute, obtuse, or even cordate at base, regularly
but usually not deeply sinuate, rather rigid, usually ver