CASTANEA AMERICANA (_American sweet chestnut_).--Leaves oblong-lanceolate, serrate, with rather coarse teeth, each terminated with a feeble prickle or spine; smooth on both sides (Fig. 19). Burs thickly covered with sharp, branching spines a half inch long or less, from a fleshy green envelope, becoming hard and somewhat woody; opening by four valves or divisions when mature. Usually three nuts in each bur, the center one flattened by compression, the two outer ones plano-convex. Shell tough and leathery, dark brown, smooth, or more or less inverted, with a silvery pubescence from the point downward; variable in size from five-eighths to an inch in diameter. Kernel sweet and fine-grained. A very large and common tree in the Middle and Northern States, living to a great age. [Illustration: FIG. 19. AMERICAN CHESTNUT LEAF.] [Illustration: FIG. 20. SPIKE OF BURS OF BUSH CHINQUAPIN. _C. nana._] CASTANEA NANA (_bush chinquapin_).--Leaves oval-lanceolate, serrate, with feeble prickles on teeth and often wanting; pale green above and white tomentose underneath. Burs in racemes, small; husk thin, opening by two divisions or lobes, instead of four, as in the last species; spines short, somewhat scattering, sessile or very short-stalked; nuts small, pointed, brown, smooth, thin-shelled, solitary or only one in a bur. Kernel fine-grained, sweet and delicious. Common from North Carolina southward to Florida, in dry soils and barrens. A medium-sized shrub or low-spreading bush, rarely reaching a hight of ten feet, the slender twigs usually tomentose. A spike of burs and leaves of this species are seen in Fig. 20. [Illustration: FIG. 21. SPIKE OF CHINQUAPIN CHESTNUT BUR. _C. pumila._] [Illustration: FIG. 22. SINGLE BUR, NUT AND LEAF OF CHINQUAPIN CHESTNUT. _C. pumila._] CASTANEA PUMILA (_chinquapin chestnut_).--Leaves oblong-lanceolate, short or acutely pointed, coarsely serrate, with incurved pointed teeth, green above, tomentose underneath. Burs in racemes (Fig. 21), two-valved. Sometimes the burs are single, as shown in Fig. 22. Spines branching from a short stalk; nuts solitary, ovoid, pointed, with dark-brown polished shell. Kernel fine-grained, sweet and excellent. A medium-sized tree twenty to forty feet high; in rich soils from New Jersey, Southern Pennsylvania and southward, to Georgia, and sparingly westward to Arkansas. [Illustration: FIG. 23. JAPAN CHESTNUT LEAF.]