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Weed Lists: Western States and Provinces
Alaska | Alberta | Arizona | British Columbia | California | Colorado | Hawaii | Idaho | Kansas | Minnesota | Montana | Nebraska | Nevada | New Mexico | North Dakota | Oregon | Saskatchewan | South Dakota | Utah | Washington | Wyoming
The 2004 edition of the publication States Noxious-Weed Seed Requirements Recognized in the Administration of the Federal Seed Act has been posted to the Seed Branch web site.
AlaskaUpdated 2005Alaska's noxious weed list is found on the web site for the Northern Latitudes Plant Materials Center (PMC), a unit of the Alaska Dept. of Natural Resources under the state Division of Agriculture. The PMC provides testing, production, development, and distribution of materials to resource industries to meet environmental requirements. Prohibited: The following are prohibited noxious weeds in Alaska:
Restricted: The following are restricted noxious weeds in Alaska. Maximum tolerances of seeds per pound have been determined for these species:
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AlbertaUpdated 2004Restricted: The following plants are designated as restricted weeds in Alberta:
Noxious: The following plants are designated as noxious weeds in Alberta:
Nuisance: The following plants are designated as nuisance weeds in Alberta:
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ArizonaUpdated 2006These plants are prohibited from entry into Arizona unless accompanied by the appropriate federal and state permits. Additional weed species are regulated by the federal government and may not be transported without specific permit.
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British Columbia Updated 2006
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CaliforniaUpdated 2005The California Department of Food and Agriculture (CDFA) list of regulated weeds is below. Note, however, that the California Invasive Plant Council (Cal-IPC) also has developed a list of wildland invasive plants that are rated according to ecological impact. The rating process is based on clear criteria and documented evidence. The Cal-IPC list has been used as a guideline (often for restoration projects), but it does not carry regulatory authority. Go to the website for more information about the Cal-IPC list and its innovative rating system that is being adopted by several other western states. "A" list: Organisms of known economic importance, subject to action by the California Dept. of Food and Agriculture including eradication, quarantine, containment, rejection of shipments, or other holding actions.
"B" list: Organisms subject to action by the California Dept. of Food and Agriculture only when they are found in a nursery; otherwise, these organisms are subject to eradication, containment, control, or holding action at the discretion of individual County Agricultural Commissioners.
"C" list: Organisms not subject to state action except to provide for general pest cleanliness in nurseries; individual County Agricultural Commissioners may take additional action against the pest within their counties.
"Q" list: Newly detected organisms that seem likely to be of economic importance, but information on them is limited. These pests are treated as "A"-rated pests, pending full evaluation.
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ColoradoUpdated 2004List A: These noxious weed species are designated by the Colorado Agricultural Commissioner for eradication prior to seed development. State noxious weed management plans have been developed for these species.
List B: These noxious weed species are recommended for management (management may be required in local jurisdictions). State noxious weed management plans will be developed for these species.
List C: The Colorado Agricultural Commissioner, in consultation with other interested parties, will develop state noxious weed management plans for List C species to support the efforts of local governing bodies to implement more effective integrated weed management on private and public lands. The goal of such plans will not be to stop the spread of these species, but to provide additional educational, research, and biological control resources to jurisdictions that choose require management of List C species.
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Hawaii1992 List
|
Scientific Name |
Common Name |
Islands Free or Relatively Free |
Acacia mearnsii |
black wattle |
Molokai |
Acaena novae- zelandiae |
New Zealand bur, piripiri |
All islands |
Acroptilon repens |
Russian knapweed |
All islands |
Aeschynomene indica |
Kat sola, Indian jointvetch |
All islands |
Ageratina adenophora |
croftonweed, Maui pamakani |
Hawaii, Kauai |
Ageratina riparia |
creeping croftonweed, Hamakua pamakani |
Kauai |
Allium vineale |
wild garlic |
All islands |
Andropogon bicornis |
West Indian foxtail |
Maui, Lanai, Molokai, Oahu, Kauai |
Andropogon virginicus |
broomsedge |
Molokai, Lanai, Oahu, Kauai |
Anredera cordifolia |
Madeira vine |
Maui |
Ardisia elliptica |
shoebutton ardisia |
Maui, Molokai, Lanai, Oahu, Kauai |
Bocconia frutescens |
plume poppy |
All islands |
Cardaria pubescens |
hairy whitetop |
All islands |
Cereus uruguayanus |
spiny tree cactus, Peruvian apple |
All islands |
Chromolaena odorata |
siamweed, bitterbush |
All islands |
Cirsium arvense |
Canada thistle |
All islands |
Clidemia hirta var. hirta |
Koster's curse, curse |
Kauai, Lanai |
Coccinia grandis |
ivy gourd |
Hawaii, Maui, Molokai, Lanai, Kauai |
Convolvulus arvensis |
field bindweed |
All islands |
Cortaderia jubata |
|
All islands |
Cymbopogon refractus |
barbwire grass |
Lanai, Oahu |
Cyperus esculentus |
yellow nutsedge |
Maui, Oahu, Lanai, Kauai, Molokai |
Cytisus monspessulanus |
French broom |
All islands |
Cytisus scoparius |
Scotch broom |
All islands |
Dichrostachys nutans |
marabu |
All islands |
Elephantopus mollis |
elephantopus, elephant’s foot |
Maui, Oahu, Lanai |
Elytrigia repens |
quackgrass |
All islands |
Emex spinosa |
spiny emex |
Lanai, Kauai |
Eriocereus martinii |
moon cactus |
All islands |
Euphorbia esula |
leafy spurge |
All islands |
Grevillea banksii |
kahiliflower, Bank's grevillea |
Lanai, Maui, Molokai |
Halogeton glomeratus |
halogeton |
All islands |
Hyptis pectinata |
comb hyptis |
Kauai, Molokai, Lanai, Oahu |
Hyptis suaveolens |
wild spikenard |
All islands |
Imperata cylindrica |
cogon |
All islands |
Lagascea mollis |
acuate |
All islands |
Lepidium latifolium |
perennial pepperweed |
All islands |
Malachra alceifolia |
malachra |
All islands |
Medinilla venosa |
|
Hawaii, Lanai, Molokai, Oahu, Kauai |
Melastoma spp. |
melastoma |
All islands |
Miconia spp. |
miconia |
All islands |
Mikania micanthra |
mile-a-minute |
All islands |
Mikania scandens |
climbing hempweed |
All islands |
Mimosa invisa |
giant sensitive plant |
All islands |
Mimosa pigra |
thorny sensitive plant |
All islands |
Miscanthus floridulus |
miscanthus, Japanese silvergrass |
All islands |
Montanoa hibiscifolia |
tree daisy |
Maui |
Myrica faya |
firetree, candleberry myrtle |
Maui, Lanai, Molokai, Oahu |
Oxyspora paniculata |
|
Maui, Molokai, Lanai, Kauai |
Panicum repens |
torpedograss |
Maui, Molokai, Lanai, Oahu, Kauai |
Passiflora mollissima |
banana passionfruit, banana poka |
Maui, Molokai, Lanai, Oahu |
Passiflora pulchella |
wingleaf passionfruit |
All islands |
Pennisetum setaceum |
fountaingrass |
Maui, Molokai, Lanai, Oahu, Kauai |
Piper aduncum |
spiked pepper |
All islands |
*Pistia stratiotes |
Nile cabbage, tropical duckweed, water cabbage, water lettuce |
|
Pittosporum undulatum |
Victorian box |
Maui, Oahu, Lanai, Kauai, Molokai |
Prosopis juliflora |
|
All islands |
Pueraria phaseoloides |
tropical kudzu |
All islands |
Rhodomyrtus tomentosa |
downy rosemyrtle |
Maui, Molokai, Lanai, Oahu |
Rubus argutus |
prickly Florida blackberry |
Lanai, Molokai |
Rubus ellipticus var. obcordatus |
yellow Himalayan raspberry |
Maui, Molokai, Lanai, Oahu, Kauai |
Rubus niveus |
hill raspberry |
Molokai, Lanai, Oahu, Kauai |
Rubus sieboldii |
Molucca raspberry |
All islands |
Salsola kali |
Russian thistle |
All islands |
*Salvinia minima |
Water fern |
|
*Salvinia molesta |
African payal, aquarium water-moss, giant salvinia, kariba weed, salvinia, water fern |
|
Senecio madagascariensis |
fireweed |
All islands |
Solanum carolinense |
horsenettle |
All islands |
Solanum elaeagnifolium |
silverleaf nightshade |
All islands |
Solanum robustum |
|
All islands |
Solanum torvum |
turkeyberry, terongan |
All islands |
Sonchus arvensis |
perennial sowthistle |
All islands |
Spartium junceum |
Spanish broom |
All islands |
Stipa trichotoma |
nasella tussock |
All islands |
Striga spp. |
witchweeds |
All islands |
Themeda villosa |
Lyon's grass |
Maui, Molokai, Lanai, Oahu, Kauai |
Tibouchina spp. |
tibouchina |
Maui, Molokai, Lanai, Oahu, Kauai |
Triumfetta rhomboidea |
paroquet bur |
Kauai, Maui |
Triumfetta semitriloba |
Sacramento bur |
Lanai, Oahu, Molokai, Kauai |
Ulex europaeus |
gorse |
Hawaii, Oahu, Lanai, Kauai, Molokai, Maui |
Urena lobata |
caesarweed |
Hawaii, Maui, Molokai, Lanai, Kauai |
Verbascum thapsus |
mullein |
Maui, Molokai, Lanai, Oahu, Kauai |
Idaho
Updated 2005
The Idaho Department of Agriculture has designated 36 plant species as noxious weeds:
- Black henbane (Hyoscyamus niger)
- Buffalobur (Solanum rostratum)
- Canada thistle (Cirsium arvense)
- Common crupina (Crupina vulgaris)
- Dalmatian toadflax (Linaria dalmatica ssp. dalmatica)
- Diffuse knapweed (Centaurea diffusa)
- Dyer's woad (Isatis tinctoria)
- Eurasian watermilfoil (Myriophyllum spicatum)
- Field bindweed (Convolvulus arvensis)
- Hoary cress (Cardaria draba)
- Johnsongrass (Sorghum halpense)
- Jointed goatgrass (Aegilops cylindrica)
- Leafy spurge (Euphorbia esula)
- Matgrass (Nardus stricta)
- Meadow hawkweed (Hieracium pratense)
- Meadow knapweed (Centaurea pratensis)
- Milium (Milium vernale)
- Musk thistle (Carduus nutans)
- Orange hawkweed (Hieracium auranticum)
- Perennial pepperweed (Lepidium latifolium)
- Perennial sowthistle (Sonchus arvensis)
- Poison hemlock (Conium maculatum)
- Puncturevine (Tribulus terrestris)
- Purple loosestrife (Lythrum salicaria)
- Rush skeletonweed (Chondrilla juncea)
- Russian knapweed (Acroption repens)
- Scotch broom (Cytisus scoparius)
- Scotch thistle (Onopordum acanthium)
- Silverleaf nightshade (Solanum elaegnifolium)
- Skeletonleaf bursage (Ambrosia tomentosa)
- Spotted knapweed (Centaurea maculosa)
- Syrian beancaper (Zygophyllum fabago)
- Tansy ragwort (Senecio jacobea)
- Toothed spurge (Euphorbia dentata)
- Yellow starthistle (Centaurea solstitialis)
- Yellow toadflax (Linaria vulgaris)
Kansas
Updated 2005
In Kansas, it is the duty of anyone who owns or supervises land "to control the spread of and to eradicate" all noxious weeds:
- Bur ragweed (Ambrosia grayii)
- Canada thistle (Cirsium arvense)
- Field bindweed (Convolvulus arvensis)
- Hoary cress (Cardaria draba)
- Johnsongrass (Sorghum halepense)
- Kudzu (Peuraria lobata)
- Leafy spurge (Euphorbia esula)
- Musk (nodding) thistle (Carduus nutans)
- Pignut (Hoffmannseggia densiflora)
- Quackgrass (Agropyron repens)
- Russian knapweed (Centaurea repens)
- Sericea lespedeza (Lespedeza cuneata)
In addition, any county may declare one or both of the following species "noxious" within the county and state statutes regarding control and eradiation will apply:
- Multiflora rose (Rosa multiflora)
- Bull thistle (Cirsium vulgare)
Minnesota
Updated 2005
Prohibited. These plants are prohibited noxious weeds because they are injurious to public health, the environment, public roads, crops, livestock, and other property. Prohibited noxious weeds must be controlled or eradicated as required by Minnesota statutes.
- Field Bindweed (Convolvulus arvensis)
- Hemp (Cannabis sativa)
- Loosestrife, purple (Lythrum salicaria, L. virgatum, or any combination)
- Mustard, garlic (Alliaria petiolata)
- Poison Ivy (Toxicodendron radicans) (native species to Minnesota)
- Spurge, leafy (Euphorbia esula)
- Sow thistle, perennial (Sonchus arvensis)
- Thistle, bull (Cirsium vulgare)
- Thistle, Canada (Cirsium arvense)
- Thistle, musk (Carduus nutans)
- Thistle, plumeless (Carduus acanthoides)
Federal noxious weed list. Parasitic and the terrestrial plants listed in the Code of Federal Regulations, title 7, section 360.200, are also prohibited noxious weeds in Minnesota.
Restricted. These plants listed are restricted noxious weeds whose only feasible means of control is to prohibit the importation, sale, and transportation of them or their propagating parts in the state except as provided by Minnesota Statutes, section 18.82.
- Buckthorn, common (Rhamnus cathartica or European)
- Buckthorn, glossy (Rhamnus frangula) (columnaris, including all cultivars tallcole, asplenifolia, and all other cultivars)
Montana
Effective March 27, 2008
Category 1. Category 1 noxious weeds are weeds that are currently established and generally widespread in many counties of the state. Management criteria includes awareness and education, containment and suppression of existing infestations and prevention of new infestations. These weeds are capable of rapid spread and render land unfit or greatly limit beneficial uses.
- Canada thistle (Cirsium arvense)
- Field bindweed (Convolvulus arvensis)
- Whitetop or Hoary cress (Cardaria draba)
- Leafy spurge (Euphorbia esula)
- Russian knapweed (Centaurea repens)
- Spotted knapweed (Centaurea maculosa)
- Diffuse knapweed (Centaurea diffusa)
- Dalmatian toadflax (Linaria dalmatica)
- St. Johnswort (Hypericum perforatum)
- Sulfur (Erect) cinquefoil (Potentilla recta)
- Common tansy (Tanacetum vulgare)
- Oxeye-daisy (Chrysanthemum leucanthemum L.)
- Houndstongue (Cynoglossum officinale L.)
- Yellow toadflax (Linaria vulgaris)
- Hoary alyssum ( Berteroa incana)
Category 2. Category 2 noxious weeds have recently been introduced into the state or are rapidly spreading from their current infestation sites. These weeds are capable of rapid spread and invasion of lands, rendering lands unfit for beneficial uses. Management criteria includes awareness and education, monitoring and containment of known infestations and eradication where possible.
- Purple loosestrife or lythrum (Lythrum salicaria, L. virgatum, and any hybrid crosses
- thereof).
- Tansy ragwort (Senecio jacobea L.)
- Meadow hawkweed complex (Hieracium pratense, H. floribundum, H. piloselloides)
- Orange hawkweed (Hieraciumaurantiacum L.)
- Tall buttercup (Ranunculus acris L.)
- Tamarisk [Saltcedar] (Tamarix spp.)
- Perennial pepperweed (Lepidium latifolium)
- Rush skeletonweed (Chondrilla juncea)
- Yellowflag iris (Iris pseudacorus)
- Blueweed ( Echium vulgare)
Category 3. Category 3 noxious weeds have not been detected in the state or may be found only in small, scattered, localized infestations. Management criteria includes awareness and education, early detection and immediate action to eradicate infestations. These weeds are known pests in nearby states and are capable of rapid spread and render land unfit for beneficial uses.
- Yellow starthistle (Centaurea solstitialis)
- Common crupina (Crupina vulgaris)
- Eurasian watermilfoil (Myriophyllum spicatum)
- Dyer’s woad (Isatis tinctoria)
- Flowering rush ( Butomus umbellatus)
- Japanese knotweed complex (Polygonum cuspidatum, sachalinense & polystachyum)
Category 4. Category 4 noxious weeds are invasive plants and may cause significant economic or environmental impacts if allowed to become established in Montana. Management criteria includes prohibition from sale by the nursery trade. Research and monitoring may result in the plant being listed in a different category.
- Scotch broom (Cytisus scoparius)
Nebraska
Updated 2004
Eight plant species are identified as noxious weeds in Nebraska:
- Diffuse knapweed (Centaurea diffusa)
- Canada thistle (Cirsium arvense)
- Leafy spurge (Euphorbia esula)
- Musk thistle (Carduus nutans)
- Plumeless thistle (Carduus acanthoides)
- Purple loosestrife (Lythrum salicaria)
- Saltcedar (tamarisk) (Tamarix ramosissima, T. parviflora)
- Spotted knapweed (Centaurea maculosa)
Nevada
Updated 2006
Nevada Noxious Weed List (NAC 555.010) (effective 10/31/05). The following weeds are designated noxious weeds:
Category A weeds are weeds that are generally not found or that are limited in distribution throughout the State. Such weeds are subject to:
- Active exclusion from the State and active eradication wherever found.
- Active eradication from the premises of a dealer of nursery stock.
Category B weeds are weeds that are generally established in scattered populations in some counties of the state. Such weeds are subject to:
- Active exclusion where possible.
- Active eradication from the premises of a dealer of nursery stock.
Category C weeds are weeds that are generally established and generally widespread in many counties of the state. Such weeds are subject to active eradication from the premises of a dealer of nursery stock.
Category A Weeds:
- African rue (Peganum harmala)
- Austrian fieldcress (Rorippa austriaca)
- Austrian peaweed (Sphaerophysa salsula / Swainsona salsula)
- Black henbane (Hyoscyamus niger)
- Camelthorn (Alhagi pseudalhagi)
- Common crupina (Crupina vulgaris)
- Dalmatian toadflax(Linaria dalmatica)
- Dyer's woad (Isatis tinctoria)
- Eurasian watermilfoil (Myriophyllum spicatum)
- Giant reed (Arundo donax)
- Giant salvinia (Salvinia molesta)
- Goats rue (Galega officinalis)
- Green fountain grass (Pennisetum setaceum)
- Houndstongue (Cynoglossum officinale)
- Hydrilla (Hydrilla verticillata)
- Iberian starthistle (Centaurea iberica)
- Klamath weed (St. Johnswort) (Hypericum perforatum)
- Malta starthistle (Centaurea melitensis)
- Mayweed chamomile (Anthemis cotula)
- Mediterranean sage (Salvia aethiopis)
- Purple loosestrife (Lythrum salicaria, L. virgatum and cultivars)
- Purple starthistle (Centaurea calcitrapa)
- Rush skeletonweed (Chondrilla juncea)
- Sow thistle (Sonchus arvensis)
- Spotted knapweed (Centaurea maculosa)
- Squarrose starthistle (Centaurea virgata var. squarrosa)
- Sulfur cinquefoil (Potentilla recta)
- Syrian bean caper (Zygophyllum fabago)
- Yellow starthistle (Centaurea solstitialis)
- Yellow toadflax (Linaria vulgaris)
Category B Weeds:
- Carolina horse nettle ( Solanum carolinense)
- Diffuse knapweed (Centaurea diffusa)
- Leafy spurge (Euphorbia esula)
- Medusahead (Taeniatherum caput-medusae)
- Musk thistle (Carduus nutans)
- Russian knapweed (Acroptilon repens)
- Sahara mustard (Brassica tournefortii)
- Scotch thistle (Onopordum acanthium)
- White horse nettle (Solanum elaeagnifolium)
Category C Weeds:
- Canada Thistle (Cirsium arvense)
- Hoary Cress (Cardaria draba)
- Johnson grass (Sorghum halpense)
- Perennial pepperweed (Lepidium latifolium)
- Poison Hemlock (Conium maculatum)
- Puncturevine (Tribulus terrestris)
- Saltcedar (tamarisk) (Tamarix ramosissima, T. parviflora)
- Water Hemlock (Cicuta maculata)
New Mexico
Updated 2005
Class A: Class A weeds are species that are not present in New Mexico or have limited distribution; preventing new infestations of these species and eradicating existing infestations is the highest priority.
- Alfombrilla (Drymaria arenarioides)
- Black henbane (Hyoscyamus niger)
- Camelthorn (Alhagi pseudalhagi)
- Canada thistle (Cirsium arvense)
- Dalmatian toadflax (Linaria genistifolia ssp. dalmatica)
- Diffuse knapweed (Centaurea diffusa)
- Dyer's woad (Isatis tinctoria)
- Eurasian watermilfoil (Myriophyllum spicatum)
- Hoary cress (Cardaria draba)
- Hydrilla (Hydrilla vericillata)
- Leafy spurge (Euphorbia esula)
- Onionweed (Asphodelus fistulosus)
- Perennial pepperweed (Lepidium latifolium)
- Purple loosestrife (Lythrum salicaria)
- Purple starthistle (Centaurea calcitrapa)
- Scotch thistle (Onopordum acanthium)
- Spotted knapweed (Centaurea maculosa)
- Yellow starthistle (Centaurea solstitialis)
- Yellow toadflax (Linaria vulgaris)
Class B: Class B weeds are species that are limited to portions of New Mexico. In areas that are not infested, these species should be treated as Class A weeds. In areas with severe infestations, management plans should be designed to contain the infestation and stop spread.
- African rue (Peganum harmala)
- Bull thistle (Cirsium vulgare)
- Halogeton (Halogeon glomeratus)
- Malta starthistle (Centaurea melitensis)
- Musk thistle (Carduus nutans)
- Russian knapweed (Acroptilon repens)
- Poison hemlock (Conium maculatum)
- Teasel (Dipsacus fullonum)
Class C: Class C weeds are species that are widespread in New Mexico. Management decisions for these species should be determined at the local level based on feasibility of control and level of infestation.
- Field bindweed (Convolvulus arvensis)
- Jointed goatgrass (Aegilops cylindrica)
- Russian olive (Elaeagnus angustifolia)
- Saltcedar (Tamarix spp.)
- Siberian elm (Ulmus pumila)
North Dakota
Updated 2004
Weeds declared "noxious" are those that are difficult to control, easily spread, and injurious to public health, crops, livestock, land or other property. The following weeds have been declared noxious in North Dakota:
- Absinth wormwood (Artemisia absinthium)
- Canada thistle (Cirsium arvense)
- Dalmatian toadflax (Linaria genistifolia ssp. dalmatica)
- Diffuse knapweed (Centaurea diffusa)
- Field bindweed (Convolvulus arvensis)
- Leafy spurge (Euphorbia esula)
- Musk thistle (Carduus nutans)
- Purple loosestrife (Lythrum salicaria, L. virgatum, and all cultivars)
- Russian knapweed (Acroptilon repens)
- Saltcedar (Tamarix ramosissima, T. chinensis, T. parviflora)
- Spotted knapweed (Centaurea maculosa)
- Yellow starthistle (Centaurea solstitialis)
Oregon
Updated 2005
"A" list: "A"-designated weeds are those of known economic importance that occur in Oregon in small enough infestations to make eradication or containment possible - or they are not known to occur, but their presence in neighboring states makes occurrence in Oregon seem imminent. It is recommended that infestations receive intensive control. (Note: A-T weeds are priority noxious weeds designated by the Oregon State Weed Board as a Target for which the Oregon Dept. of Agriculture will develop and implement a statewide management plan.)
- A-T Common cordgrass (Spartina anglica)
- A-T Dense flowered cordgrass (Spartina densiflora)
- A-T Giant hogweed(Heracleum mantegazzianum)
- A-T Iberian starthistle (Centaurea iberica)
- A-T Kudzu (Pueraria lobata)
- A-T Purple starthistle (Centaurea calcitrapa)
- A-T Smooth cordgrass(Spartina alterniflora)
- A-T Squarrose knapweed (Centaurea virgata)
- A-T Woolly distaff thistle (Carthamus lanatus)
- A-T Yellow hawkweed (Hieracium floribundum)
- African rue (Peganum harmala)
- Barbed goatgrass (Aegilops triuncialis)
- Camelthorn (Alhagi pseudalhagi)
- Coltsfoot (Tussilago farara)
- European waterchestnut (Trapa natans)
- Hydrilla (Hydrilla verticillata)
- King devil hawkweed (Hieracium piloselloides)
- Matgrass (Nardus stricta)
- Meadow hawkweed (Hieracium pratense)
- Mouse ear hawkweed (Hieracium pilosella)
- Orange hawkweed (Hieracium aurantiacum)
- Ovate goatgrass (Aegilops ovata)
- Plumeless thistle (Carduus acanthoides)
- Purple nutsedge (Cyperus rotundus)
- Silverleaf nightshade (Solanum elaegnifolium)
- Skeletonleaf bursage (Ambrosia tomentosa)
- Smooth distaff thistle (Carthamus baeticus)
- Syrian bean caper (Zygophyllum fabago)
- Texas blueweed (Helianthus ciliaris)
- Yellow floating heart (Nymphoides peltata)
B list: "B"-listed weeds are those that of economic importance that are regionally abundant, but may have limited distribution in some counties. Intensity of control is determined on a case-by-case basis. Where implementation of a fully integrated statewide management plan is not feasible, biological control shall be the main control approach. (Note: B-T weeds are priority noxious weeds designated by the Oregon State Weed Board as a Target for which the Oregon Dept. of Agriculture will develop and implement a statewide management plan.)
- B-T Gorse (Ulex europaeus)
- B-T Leafy spurge (Euphorbia esula)
- B-T Meadow knapweed (Centaurea pratensis)
- B-T Mediterranean sage (Salvia aethiopis)
- B-T Portuguese broom (Cytisus striatus)
- B-T Purple loosestrife (Lythrum salicaria)
- B-T Rush skeletonweed (Chondrilla juncea)
- B-T Saltmeadow cordgrass (Spartina patens)
- B-T Spotted knapweed (Centaurea maculosa)
- B-T Tansy ragwort (Senecio jacobaea)
- B-T Yellow starthistle (Centaurea solstitialis)
- Austrian peaweed (Sphaerophysa salsula)
- Biddy-Biddy (Acaena novae-zelandiae)
- Buffaloburr (Solanum rostratum)
- Bull thistle (Cirsium vulgare)
- Canada thistle (Cirsium arvense)
- Common bugloss (Anchusa officinalis)
- Common crupina (Crupina vulgaris)
- Cutleaf teasel (Dipsacus laciniatus)
- Creeping yellow cress (Rorippa sylvestris)
- Dalmatian toadflax (Linaria dalmatica)
- Diffuse knapweed (Centaurea diffusa)
- Dodder (Cuscuta spp.)
- Dyer's woad (Isatis tinctoria)
- English ivy (Hedera helix)
- Eurasian watermilfoil (Myriophyllum spicatum)
- False brome (Brachypodium sylvaticum)
- Field bindweed (Convolvulus arvensis)
- French broom (Cytisus monspessulanas)
- Garlic mustard (Alliaria petiolata)
- Giant horsetail (Equisetum telmateia)
- Giant knotweed (Polygonum sachalinense)
- Hairy whitetop (Cardaria pubescens)
- Halogeton (Halogeton glomeratus)
- Himalayan blackberry (Rubus discolor [precerus])
- Himalayan knotweed (Polygonum polystachyum)
- Houndstongue (Cynoglossum officinale)
- Italian thistle (Carduus pycnocephalus)
- Japanese knotweed (Polygonum cuspidatum)
- Johnsongrass (Sorghum halepense)
- Jointed goatgrass (Aegilops cylindrica)
- Kochia (Kochia scoparia)
- Lens-podded whitetop (Cardaria chalapensis)
- Medusahead rye (Taeniatherum caput-medusae)
- Milk thistle (Silybum marianum)
- Musk thistle (Carduus nutans)
- Old man's beard (Clematis vitalba)
- Perennial pepperweed (Lepidium latifolium)
- Poison hemlock (Conium maculatum)
- Policeman's helmet (Impatiens glandulifera)
- Puncturevine (Tribulus terrestris)
- Quackgrass (Agropyron repens)
- Ragweed (Ambrosia artemisiifolia)
- Russian knapweed (Acroptilon repens)
- Saltcedar (Tamarix ramosissima)
- Scotch broom (Cytisus scoparius)
- Scotch thistle (Onopordum acanthium)
- Short fringed knapweed (Centaurea nigrescens)
- Slender-flowered thistle (Carduus tenuiflorus)
- Small broomrape (Orobanche minor)
- South American waterweed (elodea) (Elodea [=Egeria] densa)
- Spanish broom (Spartium junceum)
- Spikeweed (Hemizonia pungens)
- Spiny cocklebur (Xanthium spinosum)
- St. Johnswort (Klamath weed) (Hypericum perforatum)
- Sulfur cinquefoil (Potentilla recta)
- Velvetleaf (Abutilon theophrasti)
- Whitetop (Hoary cress) (Cardaria draba)
- Wild proso millet (Panicum miliaceum)
- Yellow flag iris (Iris pseudacorus L.)
- Yellow nutsedge (Cyperus esculentus)
- Yellow toadflax (Linaria vulgaris)
Saskatchewan
Updated 2004
Those weeds designated as a "Noxious Weed" in Saskatechewan are:
- Barberry, common (Berberis vulgaris)
- Bindweed, field (Convolvulus arvensis)
- Bluebur (Lappula echinata)
- Buckwheat, wild (Polygonum convolvulus)
- Buckwheat, tartary (Fagopyrum tataricum)
- Brome, downy (Bromus tectorum)
- Brome, Japanese (Bromus japonicus)
- Campion, bladder (Silene vulgaris)
- Catchfly, night-flowering (Silene noctiflora)
- Chamomile, scentless (Matricaria perforata)
- Cleavers (Galium aparine)
- Cockle, cow (Saponaria vaccaria)
- Cockle, white (Silene alba
- Cockle, purple (Agrostemma githago)
- Dandelion (Taraxacum officinale)
- Darnel, Persian (Lolium persicum)
- False flax, small-seeded (Camelina microcarpa)
- Foxtail, green (Setaria viridis)
- Grass, quack (Elytrigia repens)
- Hoary cress, heart-podded (Cardaria draba)
- Knapweed, spotted (Centaurea maculosa)
- Knapweed, diffuse (Centaurea diffusa)
- Knapweed, Russian (Centaurea repens)
- Loosestrife, purple (Lythrum salicaria)
- Mallow, round-leaved (Malva rotundifolia)
- Mustard, hare's-ear (Conringia orientalis)
- Mustard, ball (Neslia paniculata)
- Mustard, tumble (Sisymbrium altissimum)
- Mustard, wild (Sinapis arvensis)
- Oat, wild (Avena fatua)
- Povertyweed (Iva axillaries)
- Ragweed, common (Ambrosia artemisiifolia)
- Rape, bird (Brassica rapa)
- Sowthistle, annual (Sonchus oleraceus)
- Sowthistle, perennial (Sonchus arvensis)
- Spurge, leafy (Euphorbia esula)
- Stinkweed (Thlaspi arvense)
- Thistle, nodding (Carduus nutans)
- Thistle, Russian (Salsola kali)
- Thistle, Canada (Cirsium arvense)
- Toadflax, yellow (Linaria vulgaris)
South Dakota
Updated 2006
State Noxious Weeds. Those weeds which the South Dakota Weed and Pest Commission has designated as sufficiently detrimental to the state to warrant enforcement of control measures.
- Canada thistle (Cirsium arvense)
- Hoary cress or whitetop (Cardaria draba)
- Leafy spurge (Euphorbia esula)
- Perennial sow thistle (Sonchus arvensis)
- Purple loosestrife (Lythrum salicaria)
- Russian knapweed (Centaurea repens)
- Saltcedar (Tamarix aphylla, T. chinensis, T. gallica, T. parviflora, T. ramosissima)
Local Noxious Weeds. Those weeds that the South Dakota Weed and Pest Commission has designated in one or more counties for enforcement of control measures:
- Absinth wormwood (Artemisia absinthium)
- Bull thistle (Cirsium vulgare)
- Chicory (Chichorium intybus)
- Common burdock (Arctium minus)
- Common mullein (Verbascum thapsus)
- Common tansy (Tanacetum vulgare)
- Dalmatian toadflax (Linaria dalmatica)
- Diffuse knapweed (Centaurea diffusa)
- Field bindweed (Convolvulus arvensis)
- Giant knotweed (Polygonum sachalinense)
- Houndstongue (Cynoglossum officinale)
- Musk thistle (Carduus nutans)
- Plumeless thistle (Carduus acanthoides)
- Poison hemlock (Conium maculatum)
- Puncturevine (Tribulus terrestris)
- Scotch thistle (Onopordum acanthium)
- Spotted knapweed (Centaurea maculosa)
- St. Johnswort (Hypericum perforatum)
- Yellow toadflax (Linaria vulgaris)
Utah
Updated October 2008
The following weeds are hereby officially designated and published as noxious for the State of Utah, as per the authority vested in the Commissioner of Agriculture and Food under Section 4-17-3: There are hereby designated three classes of noxious weeds in the state: Class A (EDRR) Class B (Control) and Class C (Containment).
Class A: Early Detection Rapid Response (EDRR) Declared noxious weeds not native to the sate of Utah that pose a serious threat to the state and should be considered as a very high priority.
- Black henbane (Hyoseyamus niger L.)
- Diffuse knapweed (Centaurea diffusa)
- Leafy spurge (Euphorbia esula)
- Medusahead (Taeniatherum caput-medusae)
- Oxeye daisy (Chrysanthemum leucanthemum).
- Perennial sorghum spp., including but not limited to Johnson grass (Sorghum halepense ( L.) Pers. and Sorghum almum (Sorghum almum Parodi).
- Purple loosestrife (Lythrum salicaria L.)
- Spotted knapweed (Centaurea maculosa Lam.)
- St. Johnsworts (Hypericum perforatum L.)
- Sulfur cinquefoil (Potentilla recta L.)
- Yellow starthistle (Centaurea solstitialis)
- Yellow toadflax (Linaria vulgaris Mill.)
Class B: (Control) Declared noxious weeds not native to the state of Utah, that pose a threat to the state and should be considered a high priority for control.
- *Bermudagrass (Cynodon dactylon)
- Broad-leaved peppergrass (tall whitetop) (Lepidium latifolium L.)
- Dalmatian toadflax Linaria dalmatica (L.) Mill
- Dyers woad (Isatis tinctoria)
- Hoary cress (Cardaria draba)
- Musk thistle (Carduus nutans)
- Poison hemlock (Conium maculatum L.)
- Russian knapweed (Centaurea repens)
- Scotch thistle (cotton thistle) (Onopordum acanthium)
- Squarrose knapweed (Centaurea squarrosa)
* Bermudagrass (Cynodon dactylon) shall not be a noxious weed in Washington County and shall not be subject to provisions of the Utah Noxious Weed Law within the boundaries of that county. It shall be a noxious weed throughout all other areas of the State of Utah and shall be subject to the laws therein.
Class C: (Containment) Declared noxious weeds not native to the sate of Utah that are widely spread but pose a threat to the agricultural industry and agricultural products with a focus on stopping expansion.
- Field bindweed (wild morningglory) (Convolvulus arvensis)
- Canada thistle (Cirsium arvense)
- Houndstounge (Cynoglossum officianale L.) Saltcedar (Tamarix ramosissima Ledeb.)
- Quackgrass (Agropyron repens)
Washington
Updated 2004
Class A: Class A weeds are non-native species with limited distribution in Washington. Preventing new infestations and eradicating existing infestations is the highest priority. Eradication is required by law.
- Bean-caper, Syrian (Zygophyllum fabago)
- Blueweed, Texas (Helianthus ciliaris)
- Broom, Spanish (Spartium junceum)
- Buffalobur (Solanum rostratum)
- Clary, meadow (Salvia pratensis)
- Cordgrass, denseflower (Spartina densiflora)
- Cordgrass, salt meadow (Spartina patens)
- Crupina, common (Crupina vulgaris)
- Flax, spurge (Thymelaea passerina)
- Goatsrue (Galega officinalis)
- Hawkweed, yellow devil (Hieracium floribundum)
- Hogweed, giant (Heracleum mantegazzianum)
- Hydrilla (Hydrilla verticillata)
- Johnsongrass (Sorghum halepense)
- Four o'clock, wild (Mirabilis nyctaginea)
- Knapweed, bighead (Centaurea macrocephala)
- Knapweed, Vochin (Centaurea nigrescens)
- Kudzu (Pueraria montana var. lobata)
- Lawnweed (Soliva sessilis)
- Mustard, garlic (Alliaria petiolata)
- Nightshade, silverleaf (Solanum elaeagnifolium)
- Sage, clary (Salvia sclarea)
- Sage, Mediterranean (Salvia aethiopis)
- Spurge, eggleaf (Euphorbia oblongata)
- Starthistle, purple (Centaurea calcitrapa)
- Thistle, Italian (Carduus pycnocephalus)
- Thistle, milk (Silybum marianum)
- Thistle, slenderflower (Carduus tenuiflorus)
- Velvetleaf (Abutilon theophrasti)
- Woad, dyer's (Isatis tinctoria)
Class B: Class B weeds are non-native species limited to portions of Washington. Species are designated for control in regions where they are not yet widespread. Preventing new infestations in these areas is a high priority. In regions where a Class B species is already abundant, control is decided at the local level, with containment as the primary goal.
- Arrowhead, grass-leaved (Sagittaria graminea)
- Blackgrass (Alopecurus myosuroides)
- Blueweed (Echium vulgare)
- Broom, Scotch (Cytisus scoparius)
- Bryony, white (Bryonia alba)
- Bugloss, annual (Anchusa arvensis)
- Bugloss, common (Anchusa officinalis)
- Camelthorn (Alhagi maurorum)
- Carrot, wild (Daucus carota)
- Catsear, common (Hypochaeris radicata)
- Chervil, wild (Anthriscus sylvestris)
- Cinquefoil, sulfur (Potentilla recta)
- Cordgrass, common (Spartina anglica)
- Cordgrass, smooth (Spartina alterniflora)
- Daisy, oxeye (Leucanthemum vulgare)
- Elodea, Brazilian (Egeria densa)
- Fanwort (Cabomba caroliniana)
- Fieldcress, Austrian (Rorippa austriaca)
- Floating heart, yellow (Nymphoides peltata)
- Gorse (Ulex europaeus)
- Hawkweed, mouseear (Hieracium pilosella)
- Hawkweed, orange (Hieracium aurantiacum)
- Hawkweed, polar (Hieracium atratum)
- Hawkweed,Queen-devil (Hieracium glomeratum)
- Hawkweed, smooth (Hieracium laevigatum)
- Hawkweed, yellow (Hieracium caespitosum)
- Hedgeparsley (Torilis arvensis)
- Helmet, policeman's (Impatiens glandulifera)
- Herb Robert (Geranium robertianum)
- Houndstongue (Cynoglossum officinale)
- Indigobush (Amorpha fruticosa)
- Knapweed, black (Centaurea nigra)
- Knapweed, brown (Centaurea jacea)
- Knapweed, diffuse (Centaurea diffusa)
- Knapweed, meadow (Centaurea jacea x nigra)
- Knapweed, Russian (Acroptilon repens)
- Knapweed, spotted (Centaurea biebersteinii)
- Knotweed, bohemian (Polygonum bohemicum)
- Knotweed, giant (Polygonum sachalinense)
- Knotweed, Himalayan (Polygonum polystachyum)
- Knotweed, Japanese (Polygonum cuspidatum)
- Kochia (Kochia scoparia)
- Lepyrodiclus (Lepyrodiclis holosteoides)
- Loosestrife, garden (Lysimachia vulgaris)
- Loosestrife, purple (Lythrum salicaria)
- Loosestrife, wand (Lythrum virgatum)
- Nutsedge, yellow (Cyperus esculentus)
- Oxtongue, hawkweed (Picris hieracioides
- Parrotfeather (Myriophyllum aquaticum)
- Pepperweed, perennial (Lepidium latifolium)
- Primrose, water (Ludwigia hexapetala)
- Puncturevine (Tribulus terrestris)
- Ragwort, tansy (Senecio jacobaea)
- Saltcedar (Tamarix ramosissima)
- Sandbur, longspine (Cenchrus longispinus)
- Skeletonweed, rush (Chrondrilla juncea)
- Sowthistle, perennial (Conchus arvensis ssp. arvensis)
- Spurge, leafy (Euphorbia esula)
- Spurge, myrtle (Euphorbia myrsinites)
- Starthistle, yellow (Centaurea solstitialis)
- Swainsonpea (Sphaerophysa salsula)
- Thistle, musk (Carduus nutans)
- Thistle, plumeless (Carduus acanthoides)
- Thistle, Scotch (Onopordum acanthium)
- Toadflax, Dalmatian (Linaria dalmatica ssp. dalmatica)
- Watermilfoil, Eurasian (Myriophyllum spicatum)
Class C: Class C weeds are non-native species found in Washington. Many are widespread. Long-term programs of suppression and control are a county option, depending upon local threats and the feasibility of control in local areas.
- Babysbreath (Gypsophila paniculata)
- Bindweed, field (Convolvulus arvensis)
- Butterfly bush (Buddleia davidii)
- Canarygrass, reed (Phalaris arundinacea)
- Cockle, white (Silene latifolia ssp. alba)
- Cocklebur, spiny (Xanthium spinosum)
- Cress, hoary (Cardaria draba)
- Dodder, smoothseed alfalfa (Cuscuta approximata)
- Goatgrass, jointed (Aegilops cylindrica)
- Groundsel, common (Senecio vulgaris)
- Hawkweed, spp. (Non-native Hieracium species except those listed as Class A or B)
- Henbane, black (Hyoscyamus niger)
- Iris, yellow flag (Iris pseudocorus)
- Ivy, English (4 cultivars only: Hedera hibernica 'Hibernica,' H. helix 'Baltica,' H. helix 'Pittsburgh,' H. helix 'Star')
- Mayweed, scentless (Matricaria perforata)
- Old man's beard (Clematis vitalba)
- Poison hemlock (Conium maculatum)
- Pondweed, curly-leaf (Potamogeton crispus)
- Reed, common (Phragmites australis and non-native genotypes)
- Rye, cereal (Secale cereale)
- Spikeweed (Hemizonia pungens)
- St. Johnswort, common (Hypericum perforatum)
- Tansy, common (Tanacetum vulgare)
- Thistle, bull (Cirsium vulgare)
- Thistle, Canada (Cirsium arvense)
- Toadflax, yellow (Linaria vulgaris)
- Water lily, fragrant (Nymphaea odorata)
- Whitetop, hairy (Cardaria pubescens)
- Willowherb, hairy (Epilobium hirsutum)
- Wormwood, absinth (Artemisia absinthium)
Wyoming
Updated 2004
The Wyoming Weed & Pest Control Act designates 24 plant species as noxious weeds:
- Canada thistle (Cirsium arvense)
- Common burdock (Arctium minus)
- Common Tansy (Tanacetum vulgare)
- Dalmatian toadflax (Linaria dalmatica)
- Diffuse knapweed (Centaurea diffusa)
- Dyer's woad (Isatis tinctoria)
- Field bindweed (Convolvulus arvensis)
- Hoary cress (whitetop) (Cardaria draba and Cardaria pubescens)
- Houndstongue (Cynoglossum officinale)
- Leafy spurge (Euphorbia esula)
- Musk thistle (Carduus nutans)
- Oxeye daisy (Chrysanthemum leucanthemum)
- Perennial pepperweed (giant whitetop) (Lepidium latifolium)
- Perennial sowthistle (Sonchus arvensis)
- Plumeless thistle (Carduus acanthoides)
- Purple loosestrife (Lythrum salicaria)
- Quackgrass (Agropyron repens)
- Russian knapweed (Acroptilon repens)
- Saltcedar (Tamarix spp.)
- Scotch thistle (Onopordum acanthium)
- Skeletonleaf bursage (Franseria discolor)
- Spotted knapweed (Centaurea maculosa)
- St. Johnswort (Hypericum perforatum)
- Yellow toadflax (Linaria vulgaris)
