I found these plants while hiking in Colorado, they are pretty small and have red berries slightly larger than peas. The area was old growth that had been burned in a fire at least a few years ago.
That is almost certainly some variety of wintergreen, likely alpine wintergreen (Gaultheria humifusa). See http://science.halleyhosting.com/nature/cascade/5petal/heath/gaultheria/humifusa.html for photos.
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