Height: To about 40-ft.
Trunk: Bark white with horizontal ridges.
Leaves: Oval with a broad base and a bit of a tip, about 1-2 inches across and long; edges serrate. Petiole (leaf stem) flattened, causing the leaves to constantly flutter (quake), even in the lightest breeze.
Flowers: Catkins with cottony tips.
Seeds: Small, attached to white cottony hairs.
Distribution: Most of North America and Mexico.
Elevation: Mountainous areas (6,000 to 11,500 ft), mostly around meadows and where avalanche prevents conifers from growing.