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Rocky Mountain National Park a photo of Halletts in the snow
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Rocky Mountain National Park
Trees in Winter
a photo of fall aspen leaves
Photo courtesy of and copyrighted by Ernie Bernard.
Aspens (Populus tremuloides) lose their leaves in winter and must grow new ones in the spring to be able to photosynthesize.
 
a photo of Englemann spruce
Photo courtesy of and copyrighted by Ernie Bernard.
An Engelmann spruce (Picea engelmannii) keeps its needles all winter to be able to photosynthesize quickly in Rocky Mountain National Park.

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Last Updated: August 29, 2007 at 12:50 MST