Labrador tea (Ledum glandulosum), closeup of flowerhead  and branches, against rock.  At 9900ft, along edge of western Clark Lake near Agnew Pass, Ansel Adams Wilderness, California. Now called Rhododendron columbianum.
<a href="//commons.wikimedia.org/wiki/User:Dcrjsr" title="User:Dcrjsr">Dcrjsr</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>