Part 9

g.—Base of leaf nearly symmetrical.

h.—Teeth coarse, 2-5 to the inch.

Leaves smooth, oval, 3-5 inches long; fruit a small bur with weak prickles and 3-faced nuts ½-¾ inch long =Fagus, p. 17.=

Leaves 6-8 inches long; fruit a bur with stiff prickles and 1-3 rounded, brown nuts =Castanea, p. 17.=

Leaves 2-4 inches long, broadly ovate to sub-orbicular; fruit a small capsule falling in spring =Populus, p. 15.=

Leaves 4-8 inches long, lanceolate to obovate; fruit an acorn =Quercus, p. 17.=

Leaves wavy-toothed with sharp spines, evergreen; fruit a small red drupe =Ilex, p. 24.=

Leaves 4-6 inches long, oval; fruit a short woody pod with black seeds =Hamamelis, p. 21.=

h.—Teeth fine, 6-many to the inch.

i.—Leaves not doubly serrate.

Leaves 1½-2 inches long, nearly as broad, tremulous on long petioles; fruit a small capsule. (P. tremuloides) =Populus, p. 15.=

Leaves 2-6 inches long, often narrow; twigs easily separated at the joints; fruit a small capsule =Salix, p. 14.=

Leaves 5-7 inches long, 1½-2½ inches wide, very smooth; bark acid; fruit a 5-valved capsule borne in clusters =Oxydendrum, p. 26.=

Leaves 2-5 inches long, ovate to lanceolate; bark often bitter; fruit a drupe =Prunus, p. 22.=

Leaves 3-4 inches long; fruit a red berry-like pome in clusters =Amelanchier, p. 22.=

Leaves 3-5 inches long, nearly as wide, often heart-shaped, sometimes 2-5-lobed; fruit oblong, about 1 inch long, composed of many small drupes =Morus, p. 19.=

Leaves 3-4 inches long, often doubly serrate or lobed on sterile shoots; fruit a greenish-yellow pome about 1 inch in diameter =Pyrus, p. 21.=

Leaves 4-6 inches long, ovate-lanceolate; fruit 1-2 inches long, dry, 4-winged =Halesia, p. 26.=

Leaves 4-5 inches long, ovate; fruit scarlet berry-like drupes on short stems and scattered along the branches (Ilex monticola) =Ilex, p. 24.=

Leaves 2-5 inches long; fruit cone-like, containing many dry scales (B. lenta) =Betula, p. 16.=

i.—Leaves doubly serrate.

Leaves 2-4 inches long, thin; fruit a small nut enclosed in a halberd-shaped leaf-like involucre; trunk smooth and fluted =Carpinus, p. 16.=

Leaves 3-5 inches long; fruit hop-like, composed of several inflated bracts overlapping and each containing a flat seed; bark brown with loose scales =Ostrya, p. 16.=

Leaves 2-4 inches long; bark peeling off in papery scales; fruit oblong or ovate, 1-2 inches long, composed of numerous 3-lobed scales, bearing winged nuts =Betula, p. 16.=

Leaves 1-3 inches long, sometimes serrate or lobed; twigs armed with stiff thorns; fruit a hard pome =Crataegus, p. 22.=

Leaves 3-4 inches long, often serrate or lobed; fruit a sour yellowish pome about 1 inch in diameter =Pyrus, p. 21.=

d.—Leaves lobed.

e.—Margins of lobes entire.