Tom Heutte, USDA Forest Service, Bugwood.org

Tom Heutte, USDA Forest Service, Bugwood.org

Tom Heutte, USDA Forest Service, Bugwood.org

William M. Ciesla, Forest Health Management International, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org

Steve Dewey, Utah State University, Bugwood.org

USDA NRCS PLANTS Database , Bugwood.org

John M. Randall, The Nature Conservancy, Bugwood.org

John M. Randall, The Nature Conservancy, Bugwood.org