A. Nuts in a husk that opens when ripe.
B. Husk opens in four divisions.
C. Surface of husk, spiny.
D. Nut three-angled, small, two in a husk.
Beech.
DD. Nut rounded, or flattened, 2 or 3 in a husk.
Chestnut.
CC. Surface of husk not spiny.
Hickories.
BB. Husk opens in three divisions.
Horse-chestnuts and Buckeyes.
BBB. Husk opens in two divisions; spiny.
Chinquapin.
A. Nuts in a husk that does not open when ripe.
B. Shape of nut, globular; surface, smooth.
Black Walnut.
BB. Shape of nut, oblong; surface, clammy.
Butternut.