With the rising tide of autumn, waves of saffron and gold wash over canopies of aspen near the edge of White River National Forest. A splash of saffron foliage appears when cold autumn nights trap additional sugars in the dying leaves, forming vivid red pigments. Stands of genetically identical aspen, called clones, form the same pigments simultaneously. The pictured aspen, with two canopies of different hues, may be distinct stands of clones.