Identify Noxious Weeds
To help with our mission to manage invasive species and help Keep Wyoming Wild and Beautiful, we encourage your participation in tracking these state designated weed species.
State Designated Weed List
- 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)
Contact Your Local District Office for Their County Declared List.
Identify Noxious Species
Explore these useful resources to visually identify both invasive species and native plants.
Identify Wyoming weeds with the WWPC Noxious Weed Handbook
USDA PLANTS database
NEW THREAT to Wyoming's Agriculture: Palmer Amaranth
Invasive Annual Grasses
Report Noxious Species
Report what you see. Timing is important. The sooner weeds are reported, the greater our opportunity to eradicate or control them.
- Report a weed online (login or create an account)
- Contact your local District Office
- Upload to our Facebook page