ICKORY.) Leaflets 5, the
lower pair much smaller, all oblong-lanceolate, taper-pointed, finely
serrate, downy beneath when young. Fruit globular, depressed at the top,
splitting readily into 4 wholly separate valves. Nut white, sweet,
compressed, 4-angled. Husk quite thin for the Hickories. Tree 70 to 90
ft. high, with very shaggy bark, even on quite small trees. Wild
throughout, and cultivated.

[Illustration: C. sulcata.]

2. =Carya sulcata=, Nutt. (BIG SHELLBARK. KINGNUT.) Leaflets 7 to 9,
obovate-acuminate, sharply serrate, the odd one attenuate at base and
nearly sessile; downy beneath (more so than Carya alba). Fruit large,
oval, 4-ribbed above the middle, with 4 intervening depressions. Husk
very thick, entirely separating into 4 valves. Nut large, 1 1/4 to 2 in.
long, dull-whitish, thick-shelled, usually strongly pointed at both
ends. Kernel sweet and good. Tree 60 to 90 ft. high, with a shaggy bark
of loose, narrow strips on large trees. Quite common west of the
Alleghanies.

[Illustration: C. tomentosa.]

3. =Carya tomentosa=, Nutt. (MOCKERNUT. WHITE-HEART HICKORY.) Leaflets 7
to 9 (mostly 7), lance-obovate, pointed, obscurely serrate or almost
entire, the lower surface as well as the twigs and the catkins tomentose
when young. Fruit globular or ovoid, usually with a very hard, thick
husk slightly united at base. Nut somewhat hexagonal, with a very thick
shell and well-flavored kernel. A tall, slender tree, 60 to 100 ft.
high, with a rough deeply furrowed, but not shaggy bark. Common on dry
hillsides throughout.

[Illustration: C. microcarpa.]

4. =Carya microcarpa=, Nutt. (SMALL MOCKERNUT.) Leaflets about 5 (5 to
7), oblong-lanceolate, long-pointed, finely serrate, smooth, glandular
beneath; buds small, ovate. Fruit small, subglobose, with a thin husk;
nut not sharply angled, with a thin shell; edible. A large tree, 70 to
90 ft. high; New York, Pennsylvania, and westward.

[Illustration: C. porcina.]

5. =Carya porcina=, Nutt. (PIGNUT. BROOM-HICKORY.) Leaflets 5 to 7
(usually 7), oblong-ovate, acuminate, serrate, smooth. Fruit pear-shaped
to oval, somewhat rough, splitting regularly only about half-way. Nut
large (1 1/2 to 2 in. long), brownish, somewhat obcordate, with a thick,
hard shell, and poor, bitter kernel. Tall tree, 70 to 80 ft. high, with
dark-colored heart-wood, and rather smooth bark. Common on ridges.

[Illustration: C. amara.]

6. =Carya amara=, Nutt. (BITTERNUT. SWAMP-HICKORY.) Le