Salix lutea— yellow willow. Salix lutea gross on the eaten side of the Sierra Nevada as well as in the desert mountains on the western side of the deserts.  It is found eastwards to the Mississippi River in the lower 48 and from the Northwest  Territories and lberta to Ontario in Canada. It grow near watercoursses throughout it range.  It is easily identifed by its yellow flowers.  Photographed at Regional Park Botanic Garden in Tilden Regional Park near Berkeley, CA
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/12303842@N00">John Rusk</a> from Berkeley, CA, United States of America
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/john_d_rusk/28326408779/">J20160126-0001—Salix lutea—RPBG—DxO</a>