Erysimum capitatum var. angustatum—Contra Costa wallflower. included in the CNPS Inventory of Rare and Endangered Plants on list 1B.1 (rare, threatened, or endangered in CA and elsewhere.) Also listed by the State of California as Endangered and by the Federal Government as 'Endangered '. The Contra Costa wallflower, along with the Antioch Dunes evening primrose, Antioch Dunes buckwheat, and Lange's metalmark butterfly, led to the establishment of the Antioch Dunes Wildlife Refuge in the early years of the current environmental movement.  Although the wallflower continues to be listed in the CNPS inventory and Federal regulations the taxon is no longer recognized by either The Jepson Manual, 2nd ed., or the Flora of North America.  It flourishes in the Regional Parks Botanic Garden.  Photographed in the Regional Parks Botanic Garden located 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/25303775500/">J20160303-0076—Erysimum capitatum var angustatum—RPBG</a>