DRAFT F.IS APPENDIX J 



APPENDIX 3 



NOXIOUS WEEDS OF MONTANA 



Invasive non-native species are now one of the leading threats to the integrity of our nation's forests, grasslands, and 

 waterways. However, the impact of non-native species on our economy and ecological systems is often not widely 

 recognized. Source: County Noxious Weed Control Act State of Montana Department of Agriculture Helena, 

 Montana. 



Category 1 Noxious Weeds 



Consists of 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) 



Russian knapweed (Centaiirea repens) 



Spotted knapweed ( Centaurea maculosa) 



Diffuse knapweed (Centaurea diffusa) 



Dalmatian toadflax (Linaria dalmatica) 



Field bindweed {Convolvulus arvensis) 



St. Johnswort (Hypericum perforatum) 



Sulfur (erect) cinquefoil (Potentilla recta) 



Whitetop or Hoary cress (Cardaria draba) 



Leafy spurge (Euphorbia esula) 



Common Tansy (Tanacetum vulgare) 



Ox-eye Daisy (Chrysanthemum leucanthemum L.) 



Houndstounge (Cynoglossum officinale L.) 



Category 2 Noxious Weeds 



Consists of weeds that 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 knowTi infestations, and eradication where possible. 



Purple loosestrife or lythnim (Lythrum salicaria, L virgatum, and any hybrid crosses) 



Dyers woad (Isatis tinctoria) 



Tansy Ragwort (Senecio jacobea L.) 



Meadow Hawkweed Complex (Hieracium prantense, H.) 



Orange Hawkweed (Hieracium aurantiacum L) 



Tamarisk "Salt cedar" (Tamarix spp.) 



Category 3 Noxious Weeds 



Consists of weeds that 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, rendering land unfit for beneficial uses. 



Yellow starthistle (Centaurea solstitialis) 

 Common crupina (Crupina vulgaris) 

 Rush skeletonweed ( Chondrilla juncea 



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