This alpine tree-line is photographed from a close enough distance to illustrate the decrease in both density and size of trees as conditions become unfavourable for growth at higher elevations. The green band of plants growing above the tree-line consist of shrubby mountain heathers (Phyllodoce spp. and Cassiope spp.) and various alpine wildflowers (including Castilleja spp.), but those also taper off with increasing elevation, leaving bare, exposed rock on the mountaintops.
The photograph was taken in evening light from the short trail to Peyto Lake along the Icefields Parkway in Banff National Park.