quaking aspen Salicaceae Populus tremuloides
Leaf:Alternate, simple, 1 to 3 inches long, green above and paler below, heart-shaped to nearly round with a fine toothed margin, petiole is flattened.
Flower:Species is dioecious; male and female hanging catkins 1 to 3 inches long.
Fruit:Catkin (2 to 4 inches long), with attached light green capsules which contain many small hairy seeds.
Twig:Slender, glabrous, reddish brown often with a gray, waxy film; buds conical, reddish brown, terminal bud 1/4 inch long, may be slightly resinous.
Bark:At first smooth, creamy yellowish-white to very light green; later developing thick furrows and becoming dark, especially near the base.
Form:Small (30 to 40 feet tall) upright tree, which often occurs in thickets.