The high plateau the highway crosses between the switchbacks and Beartooth Pass is alpine tundra, the southernmost large stretch of it in the United States. From roughly 10,000 feet up, the trees give out and the ground becomes a low mat of sedge, dwarf willow, and cushion plants holding scatterings of glacial tarns. In July the wildflowers run in short, intense bursts: forget-me-not, moss campion, sky pilot. The ground itself is rarely fully thawed; permafrost lenses persist under the surface even in August. from the studio