Sherman County Soil and Water Conservation District

“C” CLASS – LOW PRIORITY. A noxious weed which is wide spread throughout the County and has known economic impacts.

Bull Thistle, Cirsium vulgare

Common Rye, Secale cereale

Field Dodder, Cuscuta campestris

Jointed Goatgrass, Aegilops cylindrical

Klamath Weed (St. Johnswort), Hypericum perforatum

Little Bur (Bur Buttercup), Ranunculus testiculatus

Marestail, Contza Canadensis

Medusahead Rye, Taeniatherum caput-medusae

Perennial Pepperweed, Lepidium latifolium

Poison Hemlock, Conium macalatum

Prickly Lettuce, Lactuca serriola

Puncturevine, Triulus terrestris

Quackgrass, Elytrigia repens

Russian Thistle, Salsola iberica

Spiny Cockelbur, Xanthium spinosum

Waterhemlock, Western Cicuta douglasii

Wavyleaf Thistle, Cirsium undulatum
“A” CLASS – HIGH PRIORITY. Any noxious weed which greatly endangers the overall economic well-being of the County and has a small enough distribution where eradication is possible.

Canada Thistle,  Cirsium arvense

Houndstounge, Cynoglossum officinale L.

Jimsonweed, Datura stramonium

Kochia, Kochia scoparia

Leafy Spurge, Euphorbia esula

Knapweed Complex, Centaurea Species
    Diffuse Knapweed,  Centaurea diffusa
    Russian Knapweed, Rhaponticum repens
    Spotted Knapweed, Centaurea stoebe

Rush Skeletonweed, Chondrilla juncea

Spikeweed, Hemizonia pungens

Yellow Starthistle, Centaurea solstitialis