Part 10

Leaves oval often without lobes or with 2-3 lobes, smooth, aromatic; fruit a dark blue drupe borne on a thickened red stem =Sassafras, p. 21.=

Leaves broadly ovate, with truncate apex, 2 apical and 2-4 basal lobes; fruit a cone-like aggregate of dry, lance-shaped carpels =Liriodendron, p. 20.=

Leaves variously lobed, some with bristle-tipped teeth; fruit an acorn =Quercus, p. 17.=

e.—Margins of lobes not entire.

Leaves thick, glossy, star-shaped, with fine pointed serrate lobes; fruit a pendulous spiny spherical head about 1 inch thick, composed of numerous capsules =Liquidambar, p. 21.=

Leaves oval, pointed, often without lobes, thin, margins serrate or doubly serrate; fruit a yellowish pome 1-1½ inches thick =Pyrus, p. 21.=

Leaves oval, pointed, often without lobes, thin, margins serrate or doubly serrate; fruit a pome about two-fifths of an inch thick, often red; twigs armed with thorns =Crataegus, p. 22.=

Leaves often broadly ovate and not lobed, sometimes with 2-5 lobes, serrate; fruit oblong, about 1 inch long, an aggregate of many small dark purple drupes =Morus, p. 19.=

Leaves nearly round in outline, 3-5 lobed, coarse sinuate-toothed; fruit a round pendulous head 1 inch thick; composed of many hairy achenes =Platanus, p. 21.=

c.—Leaves opposite.

d.—Leaf margins entire or slightly undulate.

Leaves 3-5 inches long, ovate; fruit a bright red ovoid drupe, two-fifths inch long in small bunches =Cornus, p. 25.=

Leaves 4-8 inches long, ovate; fruit a dark blue ovoid drupe, ¾ of an inch long, in drooping, loose clusters =Chionanthus, p. 27.=

d.—Leaf margins not entire.

Leaves 3-5 lobed, finely or coarsely toothed, fruit a drooping samara =Acer, p. 24.=

Leaves not lobed, 1-3 inches long, oval, finely toothed; fruit a dark blue drupe borne in clusters =Viburnum, p. 27.=

a.—Leaves compound.

b.—Leaves alternate.

c.—Margins of leaflets entire.

Leaves pinnate, 8-14 inches long; fruit a pod 2-4 inches long; limbs bearing short spines in pairs at the nodes =Robinia, p. 23.=

Leaves 3-foliate; fruit a samara, winged all around, in drooping clusters =Ptelea, p. 23.=

Leaves pinnate with 9-21 leaflets; fruit small, red or white dry drupes in dense upright or loose drooping clusters =Rhus, p. 23.=

c.—Margins of leaflets not entire.

Leaves pinnate with 11-23 serrate leaflets; fruit a large sculptured nut =Juglans, p. 15.=

Leaves odd-pinnate, with 3-11 leaflets; fruit a smooth or angled nut =Carya, p. 15.=

Leaves odd-pinnate, with 13-17 lance-shaped leaflets; fruit a small red acid pome, borne many in a flat-topped cluster. (Pyrus Americana) =Pyrus, p. 21.=

Leaves doubly compound with many ovate serrate leaflets; fruit a small ovoid black berry in large branching clusters; twigs and trunk armed with sharp spines =Aralia, p. 25.=

b.—Leaves opposite.