Photo: Populus tremuloides.

Wet forest on a slope. Purgatory, CO, US. Wild. 1996-07-26.
Populus tremuloides Michx. Engl.: quaking aspen, American aspen, American poplar, trembling aspen, white poplar. Deu.: Amerikanische Espe. Fran.: peuplier faux-tremble. Bot. syn.: Populus aurea Tidestrom, Populus x polygonifolia Bernard
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Photo: Populus tremuloides.