black cottonwood

(noun) North American poplar with large rounded scalloped leaves and brownish bark and wood. Synonyms: swamp cottonwood, black cottonwood, downy poplar, swamp poplar, Populus heterophylla.

(noun) cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath. Synonyms: black cottonwood, Western balsam poplar, Populus trichocarpa.