Definition of 'black cottonwood'

Noun

1. North American poplar with large rounded scalloped leaves and brownish bark and wood
      Synonyms: swamp cottonwood downy poplar swamp poplar Populus heterophylla
2. cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath
      Synonyms: Western balsam poplar Populus trichocarpa

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