Dark blue flower of the <b><a href="https://en.wikipedia.org/wiki/Psorothamnus_spinosus" class="extiw" title="en:Psorothamnus spinosus">Smoke tree - <i>Psorothamnus spinosus</i></a></b>, also vernacularly known as the Smokethorn and Indigobush. 
<ul><li>Photographed at the information center of <a href="//commons.wikimedia.org/wiki/Category:Anza-Borrego_Desert_State_Park" title="Category:Anza-Borrego Desert State Park">Anza-Borrego Desert State Park</a>, in the Colorado Desert, southern California, U.S.</li>
<li>The top section of the plant has many green insects feeding.</li></ul>
<a href="//commons.wikimedia.org/wiki/User:Ciar" title="User:Ciar">Ciar</a>
<span class="int-own-work" lang="en">Own work</span>