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Colorado Noxious Weeds (including Watch List), effective June, 2020 <br /> List A Species (25) <br /> Common Scientific <br /> African rue (Peganum hormala) <br /> Bohemian knotweed (Fallopia x bohemicum) <br /> Camelthorn (Alhagi maurorum) <br /> Common crupina (Crupina vulgaris) <br /> Cypress spurge (Euphorbia cyparissias) <br /> Dyer's woad (Isatis tinctoria) <br /> Elongated mustard (Brassica elongato) <br /> Flowering rush (Butomus umbellatus) <br /> Giant knotweed (Fallopia sacholinensis) <br /> Giant reed (Arundo donax) <br /> Giant salvinia (Salvinia molesta) <br /> Hairy willow-herb (Epilobium hirsutum) <br /> Hydrilla (Hydrillo verticillata) <br /> Japanese knotweed (Fallopia japonica) <br /> Meadow knapweed (Centaurea x moncktonii) <br /> Mediterranean sage (Salvia aethiopis) <br /> Medusahead (Toeniatherum caput-medusae) <br /> Myrtle spurge (Euphorbia myrsinites) <br /> Orange hawkweed (Hieracium aurantiocum) <br /> Parrotfeather (Myriophyllum aquaticum) <br /> Purple loosestrife (Lythrum solicaria) <br /> Rush skeletonweed (Chondrilla juncea) <br /> Squarrose knapweed (Centaurea virgata) <br /> Tansy ragwort (Senecio jacobaeo) <br /> Yellow starthistle (Centaurea solstitialis) <br /> List 8 Species (38) <br /> Common Scientific <br /> Absinth wormwood (Artemisia absinthium) <br /> Black henbane (Hyoscyamus niger) <br /> Bouncingbet (Saponaria officinalis) <br /> Bull thistle (Cirsium vulgare) <br /> Canada thistle (Cirsium arvense) <br /> Chinese clematis (Clematis orientalis) <br /> Common tansy (Tanacetum vulgare) <br /> Common teasel (Dipsacus fullonum) <br /> Cutleaf teasel (Dipsacus laciniatus) <br /> Dalmatian toadflax, broad-leaved (Linaria dalmatica) <br /> Dalmatian toadflax, narrow-leaved (Linaria genistifolia) <br /> Dame's rocket (Hesperis matronalis) <br /> Diffuse knapweed (Centaurea diffusa) <br /> Eurasian watermilfoil (Myriophyllum spicatum) <br /> Hoary cress (Cardaria draba) <br /> Houndstongue (Cynoglossum officinale) <br />