Fall Colors (28 images)

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The American Aspen tree (Populus tremuloides) is often prominent in the landscape of the mountain west. Quaking or Trembling are other common names for this variety of aspen found in the northern and western portions of North America. A deciduous tree that tends to grow in "clonal colonies" and generally spreads by means of root suckers.
As the photoperiod shortens and temperatures cool green chlorophyl dies leaving behind red, orange or yellow carotenoids to color the...
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