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Aspens are trees of the willow family and comprise a section of the poplar genus, Populus sect. Populus. There are six species in the section, one of them atypical, and one hybrid: The five typical aspens are all native to cold regions with cool summers, in the far north of the Northern Hemisphere, extending south only at high altitudes in mountains. The White Poplar by contrast is native to much warmer regions, with hot, dry summers. They are all medium-sized deciduous trees reaching 15–25 m tall, exceptionally to 30 m.
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Colorado, USA
