JUGLANDÀCEAE. The Walnut Family.

Trees with large, aromatic, odd pinnate leaves; flowers appearing after the leaves unfold, the staminate in catkins, the pistillate solitary or in clusters; fruit a nut in a fleshy or hard fibrous shell; kernel edible or astringent.

Pith of twigs chambered; staminate catkins thick, sessile or short stalked; stamens 8-40, glabrous; nuts with a network of rough projections[1 Juglans.]
Pith of twigs not chambered; staminate catkins slender, long-stalked; stamens 3-10, hairy; nuts more or less angled but smooth[2 Carya.]

1. JÙGLANS. The Walnuts.

Trees with furrowed bark; pulp surrounding nut continuous, without lines of dehiscence on the surface.

Plate 19.

POPULUS TREMULOIDES Michaux. Quaking Aspen. (× 1/2.)