Smooth grass-of-parnassus (Parnassia californica) flower close, showing 5 veined white petals and clustered stamens.  Along trail above Mildred Lake, John Muir Wilderness, Sierra Nevada, California USA.
<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>