Joseph M. DiTomaso, University of California - Davis, Bugwood.org

Bonnie Million, Bureau of Land Management, Bugwood.org

Clinton Shock, Oregon State University, Bugwood.org

Clinton Shock, Oregon State University, Bugwood.org

Clinton Shock, Oregon State University, Bugwood.org

Clinton Shock, Oregon State University, Bugwood.org

Bonnie Million, Bureau of Land Management, Bugwood.org

Clinton Shock, Oregon State University, Bugwood.org

Clinton Shock, Oregon State University, Bugwood.org

Clinton Shock, Oregon State University, Bugwood.org

Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org