Utah serviceberry (Amelanchier utahensis), branch of generally 5-petaled white flowers with many short golden stamens, in clusters along smooth branchlet. Leaves elliptic and fairly smooth, serrate above middle.  At 2,998 m (9,836 ft) along High Trail (part of Pacific Crest Trail) below Agnew Pass, Ansel Adams Wilderness, California.
<a href="//commons.wikimedia.org/wiki/User:Dcrjsr" title="User:Dcrjsr">Dcrjsr</a>
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<span class="int-own-work" lang="en">Own work</span>