#cottonwood  any of several North American trees of the genus Populus having a tuft of cottony hairs on the seed
  supertype:  #poplar_tree__poplar  any of numerous trees of north temperate regions having light soft wood and flowers borne in catkins
  subtype:  #Eastern_cottonwood__necklace_poplar__Populus_deltoides  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
  subtype:  #black_cottonwood__blackcottonwood__Western_balsam_poplar__Populus_trichocarpa  cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath
  subtype:  #swamp_cottonwood__swampcottonwood__black_cottonwood__blackcottonwood__downy_poplar__downypoplar__swamp_poplar__swamppoplar__Populus_heterophylla  North American poplar with large rounded scalloped leaves and brownish bark and wood

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