To learn more about County Declared Noxious Weeds, visit website for each county.
State Designated Species List
State of WY Designated Noxious Weeds (W.S. 11-5-102 (a)(xi)
- Field bindweed (Convolvulus arvensis L.)
- Canada thistle (Cirsium arvense L.)
- Leafy spurge (Euphorbia esula L.)
- Perennial sowthistle (Sonchus arvensis L.)
- Quackgrass (Agropyron repens (L.) Beauv.)
- Hoary cress (whitetop) (Cardaria draba and Cardaria pubescens (L.) Desv.)
- Perennial pepperweed (giant whitetop) (Lepidium latifolium L.)
- Ox-eye daisy (Chrysanthemum leucanthemum L.)
- Skeletonleaf bursage (Franseria discolor Nutt.)
- Russian knapweed (Centaurea repens L.)
- Yellow toadflax (Linaria vulgaris L.)
- Dalmatian toadflax (Linaria dalmatica (L.) Mill.)
- Scotch thistle (Onopordum acanthium L.)
- Musk thistle (Carduus nutans L.)
- Common burdock (Arctium minus (Hill) Bernh.)
- Plumeless thistle (Carduus acanthoides L.)
- Dyers woad (Isatis tinctoria L.)
- Houndstongue (Cynoglossum officinale L.)
- Spotted knapweed (Centaurea maculosa Lam.)
- Diffuse knapweed (Centaurea diffusa Lam.)
- Purple loosestrife (Lythrum salicaria L.)
- Saltcedar (Tamarix spp.)
- Common St. Johnswort (Hypericum perforatum)
- Common Tansy (Tanacetum vulgare)
- Russian olive (Elaeagnus angustifolia)
- Black Henbane (Hyoscyamus Niger L.)
- Common Mullein (Verbascum thapsus L.)
- Yellow starthistle (Centaurea solstitialis L.)
- Ventenata (Ventenata dubia (Leers) Coss.)
- Medusahead rye (Taeniatherum caput-medusae (L.) Nevski)
- Palmer amaranth (Amaranthus palmeri)
To learn more about County Declared Noxious Weeds, visit website for each county.