Chamisso's Arnica

Arnica Chamissonis, or Chamisso’s Arnica, is an extremely hairy species usually found near water. The leaves are very long, narrow and slightly toothed, the lower ones tapering into a marginal stalk and the upper ones being broad at the base and somewhat clasping. The flowers are both tubular and radiate flowers; receptacle flat; rays slightly toothed at the apex.

This is the most common species of Arnica in the mountains, and is a handsome plant, standing from one to two feet high. It has pale green hairy leaves, which are markedly heart-shaped at the base, and many attractive blossoms composed of light golden rays, their deep yellow centers consisting of numerous disk-flowers. These blossoms, which are enclosed in a hairy involucre, formed by a series of narrow green bracts, grow singly or in pairs at the ends of the long slender stalks. The pappus is white.
(http://chestofbooks.com/flora-plants/flowers/North-American-Mountains/Arnicas.html)

Photographed near Dawson City, Yukon, Canada.
Canon EOS Digital Rebel XTi; 17-85mm lens
1/500 sec.; F/14; 56mm; ISO400