This small to medium-sized, deciduous, perennial tree also goes by the names Trembling Poplar, Alamo Blanco, and Golden, Trembling, or Mountain Aspen. It can reach 30 to 50 feet in height, with smooth, white bark. The tree grows silvery catkins before the leaves appear, and the foliage turns a bright yellow in the fall. It grows in full sun to shade, and is common along streams and wetlands, or on cool slopes with moist soils.