| 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 |
| cottonwood | (n) any of several North American trees of the genus Populus having a tuft of cottony hairs on the seed |
| eastern cottonwood | (n) a common poplar of eastern and central United States; cultivated in United States for its rapid growth and luxuriant foliage and in Europe for timber, Syn. necklace poplar, Populus deltoides |
| 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 |
| white basswood | (n) American basswood of the Allegheny region, Syn. cottonwood, Tilia heterophylla |
