Crook County Weeds

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    • News
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    • Weeds
      • County Declared Species
      • State Designated Species
    • Tools and Resources
      • Calibration Tools
      • Resources
  • Home
  • News
  • Programs
  • Weeds
    • County Declared Species
    • State Designated Species
  • Tools and Resources
    • Calibration Tools
    • Resources

State Designated Noxious Weeds

W.S. 11-5-102 (xi)

 "Designated noxious weed" means plant species having seeds or other plant parts determined to be detrimental to the general health or welfare of the state based upon the following: 

(A) Has demonstrated the ability to aggressively invade native plant communities and agricultural crops; 

(B) Is injurious or poisonous to livestock; 

(C) Is a carrier of disease or parasites; 

(D) Can, by virtue of either direct or indirect effect, negatively impact management of agricultural or natural ecosystems. 

Canada Thistle

California thistle, creeping thistle, field thistle  

Field Bindweed

Leafy Spurge

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PERENNIAL PEPPERWEED

Tall whitetop, giant whiteweed, perennial peppergrass, slender perennial peppercress, broadleaf or broadleaved pepperweed and ironweed. 

PERENNIAL SOWTHISTLE

Corn sow thistle, creeping sow thistle, field milk thistle, field sow thistle, and hare’s lettuce 

WHITETOP (HOARY CRESS)

 Hoary cress, whiteweed, peppergrass, heart-podded hoary cress, hoary cardari 

QUACKGRASS

Couch grass and dog grass 

SKELETONLEAF BURSAGE

Burr ragweed, silverleaf povertyweed 

MUSK THISTLE

Nodding thistle 

COMMON BURDOCK

 Lesser burdock, bardane, beggar’s button 

PLUMELESS THISTLE

Spiny plumeless thistle 

HOUNDSTONGUE

Beggar's lice, Gypsy flower, rats and mice and dog bur 

DIFFUSE KNAPWEED

White knapweed, spreading knapweed, tumble knapweed 

PURPLE LOOSESTRIFE

Purple lythrum, bouquet-viole, spiked loosestrife  

SCOTCH THISTLE

Cotton thistle, heraldic thistle, Scotch cottonthistle 

COMMON ST. JOHN'S-WORT

St. John's-wort, Common St. John's-wort, Klamath weeds, tipton weed, perforate St John's-wort, 

RUSSIAN KNAPWEED

Turestan thistle, creeping knapweed, Russian cornflower 

DYER'S WOAD

Woad or glastum 

BLACK HENBANE

Insane root, stinking nightshade, fetid nightshade, hog’s beam 

COMMON TANSY

Buttons, Golden buttons 

MEDUSAHEAD RYE

Medusahead 

COMMON MULLIEN

Flannel leaf, feltwort, woolly mullein, velvetplant, velvet dock, flannelplant, big taper 

RUSSIAN OLIVE

Russian olive 

YELLOW STARTHISTLE

Yellow Star-Thistle 

SPOTTED KNAPWEED

Spotted knapweed, bushy knapweed 

VENTENATA GRASS

 North Africa grass and wiregrass 

SALTCEDAR

Tamarisk, saltcedar, tamarix, French tamarisk; small-flowered tamarisk  

YELLOW TOADFLAX

 Wild snapdragon, common toadflax, ramsted, flaxweed, Jacob’s ladder, Butter and eggs r 

OXEYE DAISY

Oxeye daisy, ox-eye daisy, margarite, white daisy 

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