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Colorado's Noxious Weed List <br />The Colorado Noxious Weed Act and supporting Rules establish a prioritized list <br />of noxious weeds. For detailed information visit the State's site. <br />A List <br />List A species are invasive weeds that are either not known to occur in Colorado or are of very <br />limited distribution and are required to be eradicated. <br />African rue (Peganum harmala) <br />Camelthom (Alhaagi pseudalhagi) <br />Common crupina(Crupina vulgaris) <br />Cypress purge (Euphorbia cyparissias) <br />Dyer's woad (Isatis tinctoria) <br />Giant salvinia (Salvinia molesta) <br />Hydrilla (Hydrilla verticillata) <br />Meadow kn pweed (Centaurea pratensis) <br />Mediterranean sage (Salvia aethiopis) <br />Medusahead (Taeniatherum caput-medusae) <br />Myrtle spurge (Euphorbia myrsinites) <br />Orange hawkweed (Hieracium aurantiacum) <br />Purple loosestrife (Lythrum salicaria) <br />Rush skeletonweed (Chondrilla iuncea) <br />Sericea lespedeza (Lespedeza cuneata) <br />Sq_uarrose knapweed Centaurea virgata) <br />Tansy ragwort (Senecio jacobaea) <br />Yellow starthistle (Centaurea solstitialis) <br />B List <br />List B species are invasive weeds with populations of varying distribution and densities within <br />the state. The level of mandated control is based on local conditions. These weeds may require <br />eradication within certain areas of the state. <br />Absinth wormwood (Artemisia absinthium) <br />Black henbane (Hyoscyamus niger) <br />Bouncinabet (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 />Corn chamomile (Anthemis arvensis) <br />Cutleaf teasel (Dipsacus laciniatus)