#aspen  any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind
  supertype:  poplar_tree__poplar  any of numerous trees of north temperate regions having light soft wood and flowers borne in catkins
  subtype:  European_quaking_aspen__quaking_aspen__quakingaspen__Populus_tremula  Old World aspen with a broad much-branched crown; northwestern Europe and Siberia to North Africa
  subtype:  American_quaking_aspen__American_aspen__Populus_tremuloides  slender aspen native to North America
  subtype:  Canadian_aspen__bigtooth_aspen__bigtoothed_aspen__big-toothed_aspen__bigtoothedaspen__large-toothed_aspen__largetoothedaspen__large_tooth_aspen__largetoothaspen__Populus_grandidentata  aspen with a narrow crown; eastern North America

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