| black cottonwood | (n) cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath, Syn. Populus trichocarpa, Western balsam poplar |
| swamp cottonwood | (n) North American poplar with large rounded scalloped leaves and brownish bark and wood, Syn. Populus heterophylla, downy poplar, black cottonwood, swamp poplar |