+ Photo Credit:

(giant hogweed) Courtesy of Terry English, USDA APHIS PPQ, Bugwood.org / (goatsrue) Utah Dept. of Agriculture / (Iberian starthistle) Courtesy of Ross O’Connell, The Regents of the University of California / (policeman’s helmet) Richard Old, XID Services, www.xidservices.com / (purple starthistle) J.M. DiTomaso, The Regents of the University of California / (squarrose knapweed) Steve Dewey, Utah State University, Bugwood.org / (Syrian beancaper) J.M. DiTomaso, The Regents of the University of California / (tall hawkweed) Emmet J Judziewicz, Wisconsin State Herbarium / (Turkish thistle) Courtesy of Mark Porter / (yellow devil hawkweed) Linda Wilson, University of Idaho / (Cytisus) Leslie J. Mehrhoff, University of Connecticut, Bugwood.org / (Genista) Robert Vidéki, Doronicum Kft., Bugwood.org / (Spartium) John M. Randall, The Nature Conservancy, Bugwood.org / (Chamaecytisus) Jasenka Topic - Saxifraga / (black henbane) J.M. DiTomaso, The Regents of the University of California / (bohemian knotweed) King County Washington, Noxious Weed Program / (buffalobur) J.M. DiTomaso, The Regents of the University of California / (common Crupina) J.M. DiTomaso, The Regents of the University of California / (dyer’s woad) J.M. DiTomaso, The Regents of the University of California / (giant knotweed) Jan Samanek, State Phytosanitary Administration, Bugwood.org / (Japanese knotweed) J.M. DiTomaso, The Regents of the University of California / (johnsongrass) J.M. DiTomaso, The Regents of the University of California / (matgrass) Gil Wojciech, Polish Forest Research Institute, Bugwood.org / (meadow knapweed) J.M. DiTomaso, The Regents of the University of California / (Mediterranean sage) J.M. DiTomaso, The Regents of the University of California / (musk thistle) J.M. DiTomaso, The Regents of the University of California / (orange hawkweed) Michael Shephard, USDA Forest Service, Bugwood.org / (perennial sowthistle) Steve Dewey, Utah State University, Bugwood.org / (Russian knapweed) J.M. DiTomaso, The Regents of the University of California / (scotch broom) J.M. DiTomaso, The Regents of the University of California / (small bugloss) Richard Old, XID Services, www.xidservices.com / (vipers bugloss) Bill Hargrave, Kootenai County Noxious Weed Control / (yellow hawkweed) Elizabeth Bella, USDA Forest Service, Bugwood.org / (canada thistle) J.M. DiTomaso, The Regents of the University of California / (dalmatian toadflax) J.M. DiTomaso, The Regents of the University of California / (diffuse knapweed) J.M. DiTomaso, The Regents of the University of California / (field bindweed) J.M. DiTomaso, The Regents of the University of California / (hoary alyssum) Richard Old, XID Services, www.xidservices.com / (houndstongue) J.M. DiTomaso, The Regents of the University of California / (jointed goatgrass) J.M. DiTomaso, The Regents of the University of California / (leafy spurge) J.M. DiTomaso, The Regents of the University of California / (milium) Wyoming Weed and Pest Council / (oxeye daisy) Terry Spivey, USDA Forest Service, Bugwood.org / (perennial Pepperweed) J.M. DiTomaso, The Regents of the University of California / (plumeless thistle) J.M. DiTomaso, The Regents of the University of California / (poison hemlock) J.M. DiTomaso, The Regents of the University of California / (puncturevine) Steve Dewey, Utah State University, Bugwood.org / (purple loosestrife) Linda Wilson, University of Idaho, Bugwood.org / (rush Skeletonweed) J.M. DiTomaso, The Regents of the University of California / (saltcedar) J.M. DiTomaso, The Regents of the University of California / (scotch thistle) J.M. DiTomaso, The Regents of the University of California / (spotted knapweed) J.M. DiTomaso, The Regents of the University of California / (tansy ragwort) J.M. DiTomaso, The Regents of the University of California / (white bryony) Richard Old, XID Services, www.xidservices.com / (whitetop) J.M. DiTomaso, The Regents of the University of California / (yellow starthistle) Steve Dewey, Utah State University, Bugwood.org / (yellow toadflax) Steve Dewey, Utah State University, Bugwood.org.