Declared Noxious Weeds - 2008
Noxious Weed Species Common Name |
Scientific Name |
| Category I noxious weeds are weeds that are currently established and generally widespread in many counties of the state. Management criteria include 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 |
| Dalmation Toadflax | Linaria dalmatica |
| St. Johnswort | Hypericum perforatum |
| Sulfur Cinquefoil | Potentilla recta |
| Common Tansy | Tanacetrm vulgare |
| Oxeye-daisy | Chrysanthemum leucanthemun |
| Houndstongue | Cynoglossum officinale |
| Yellow Toadflax | Linaria vulgaris |
| Hoary Alyssum | Berteroa incana |
| Category II 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 include awareness and education, monitoring and containment of known infestations and eradication where possible. | |
| Purple Loosestrife or lythrum | Lythrum salicaria, L virgatum & any hybrid crosses thereof |
| Tansy Ragwort | Senecio jacobaea |
| Meadow Hawkweed | Hieracium pratense |
| Orange Hawkweed | Hieracium aurantiacum |
| Tall Buttercup | Ranunculus acris |
| Tamarisk (Saltcedar) | Tamarix ramosissima |
| Perennial Pepperweed | Lepidium latifolium |
| Rush Skeletonweed | Chondrilla juncea |
| Yellowflag Iris | Iris pseudacorus |
| Blueweed | Echium vulgare |
| Category III noxious weeds have not been detected in the state or may be found only in small, scattered, localized infestations. Management criteria include 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 vulgraris |
| Eurasian Watermilfoil | Myriophyllum spicatum |
| Dyer's Woad | Isatis tinctoria |
| Flowering Rush | Butomus umbellatus |
| Japanese Knotweed Complex | Polygonum cuspidatum, sachalinense & polystachyum |
| Category IV noxious weeds are invasive plants and may cause significant economic or environmental impacts if allowed to become established in Montana. Management criteria include 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 |
Madison County Weed List |
|
| Field Scabious | Knautia arvensis |
| Musk Thistle | Carduus nutans |
