|This is an upright, suckering deciduous shrub or small tree, to 12' tall and 15' wide. Forms thickets. Leaves are narrow, lanceolate, tapered, grayish-silver hairs when young, grayish-green later, up to 4" long. Narrow, grayish-yellow catkins, males to 2" long with yellow anthers, females to 2 1/2" long. A beautiful specimen by water, but don't plant this tree anywhere near a septic system or its lines or you and the Roto-Rooter man will know each other on a first name basis. Native to Western North America.