<i><b><a href="//commons.wikimedia.org/wiki/Category:Ceanothus_spinosus" title="Category:Ceanothus spinosus">Ceanothus spinosus</a></b></i> — Greenbark ceanothus. 
<ul><li>On the Grotto trail in <a href="//commons.wikimedia.org/wiki/Category:Circle_X_Ranch_Park" title="Category:Circle X Ranch Park">Circle X Ranch Park</a>, in the <a href="//commons.wikimedia.org/wiki/Category:Santa_Monica_Mountains_National_Recreation_Area" title="Category:Santa Monica Mountains National Recreation Area">Santa Monica Mountains National Recreation Area</a>, Southern California.</li></ul>
Anthony J. Valois
<ul><li>National Park Service, National Recreation Area Santa Monica Mountains: <i><a rel="nofollow" class="external text" href="http://www.nps.gov/samo/naturescience/Lavender-to-Blue-Blossoms.htm">Lavender to Blue Blossoms</a></i></li>
<li>National Park Service, Southern California Research Learning Center: <i><a rel="nofollow" class="external text" href="http://www.researchlearningcenter.com/bloom/species/Ceanothus_spinosus.htm">Greenbark Ceanothus</a></i></li></ul>