Davy's Centaury. The really cool thing about this small flower are the anthers.  Look on larger size to see how twisted they are as well as the pollen on the petals.  Found on the Quarry Trail.
<a rel="nofollow" class="external text" href="https://flickr.com/people/33466410@N00">Jerry Kirkhart</a>
CC BY 2.0
originally posted to <b><a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a></b> as <a rel="nofollow" class="external text" href="https://flickr.com/photos/33466410@N00/4683258693">Davy's Centaury (Centaurium davyi)</a>