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More Populus tremuloides fall color photographs.
Populus tremuloides (Aspen) 
Salicaceae (Willow Family)

Montane, subalpine. Woodlands. Spring.
Dolores River, October 12, 2004.

Golden Aspens on the mountainside give way to golden Narrow Leaf Cottonwoods at streamside.

Populus tremuloides (Aspen) 
Salicaceae (Willow Family)

Montane, subalpine. Woodlands. Spring.
Bear Creek Trail, October 4, 2007.

Betty and Willi trod the yellow leaves of Aspens on a rainy day in hunting season.

Populus tremuloides
Populus tremuloides (Aspen) 
Salicaceae (Willow Family)

Montane, subalpine. Woodlands. Spring.
West Mancos Trail, October 2, 2012.

Aspen bark photosynthesizes and since Aspens lose their lower branches, more sunlight hits the trunks and more photosynthesis takes place.

Populus tremuloides (Aspen) 
Salicaceae (Willow Family)

West Mancos Trail, October 9, 2008 and
Calico Trail, September 29, 2009
.

Above:  Sun-loving Aspens on the mountainside will some day give way to shade-producing
Picea engelmannii (Engelmann Spruce) and Pinus ponderosa (Ponderosa Pine) that are already making strong inroads
into the Aspen grove.  Picea and Pinus can sprout
in the shade of the Aspens, but Aspens rarely sprout in the shade of other trees.

Below:  Subdued yellows of Symphoricarpos rotundifolia (Snowberry shrubs),
maroons of Quercus gambelii (Gambel's Oak),
and a few young Aspens provide
the foreground for golden Aspens on the mountain side
across the Dolores River Valley.

Populus tremuloides

In the final photograph, Aspens glow along the Dolores River
in a warm October sun.

Populus tremuloides