'black cottonwood' definitions:

North American poplar with large rounded scalloped leaves and brownish bark and wood [syn: swamp cottonwood, black cottonwood, downy poplar, swamp poplar, Populus heterophylla]

Cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath [syn: black cottonwood, Western balsam poplar, Populus trichocarpa]