Noun black cottonwood has 2 senses
  1. swamp cottonwood, black cottonwood, downy poplar, swamp poplar, Populus heterophylla - North American poplar with large rounded scalloped leaves and brownish bark and wood
    --1 is a kind of cottonwood
  2. black cottonwood, Western balsam poplar, Populus trichocarpa - cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath
    --2 is a kind of cottonwood
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