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2019 Biological Resources Inventory Report <br /> 1.2.2 Noxious Weeds <br /> The state of Colorado promulgated the Colorado Noxious Weed Act(Act) in 1990 within Title 35, Article <br /> 5.5, Parts 110 through 119, in 1990. The Act initially created three lists: A, B and C (CDA 2017a). The <br /> state subsequently added a watch list. The most recent update to the weed lists became effective March <br /> 31, 2017. The Act requires A-list species to be eradicated wherever detected to protect neighboring <br /> communities and the state as a whole. There are 25 species on the A list. The B list represents those <br /> species for which the state of Colorado and local governments will develop noxious weed management <br /> plans to stop the continued spread of these species. The B list contains 38 species. Species on the C list <br /> are those species that the state will assist governing bodies manage through education, research, and <br /> biological controls. The C list includes 15 species. The watch list includes 24 species of weeds that are <br /> documented for advisory and educational purposes only at this time. The state listed noxious weeds are <br /> provided in Table 1. <br /> Table 1: <br /> Colorado Noxious Weed List <br /> List' Common Name Scientific Name' <br /> Colorado List A <br /> African rue Peganum harmala <br /> Camelthorn Alhagi pseudalhagi <br /> Common crupina Crupina vulgaris <br /> Cypress spurge Euphorbia cyparissias <br /> Dyer's woad Isatis tinctoria <br /> Elongated mustard Brassica elongata <br /> Flowering rush Butomus umbellatus <br /> Giant reed Arundo donax <br /> Giant salvinia Salvinia molesta <br /> Hairy willow-herb Epilobium hirsutum <br /> Hydrilla Hydrilla verticillata <br /> Bohemian Knotweed Polygonium x bohemicum <br /> Giant Knotweed Polygonium sachalinese <br /> Japanese Knotweed Polygonium cuspidatum <br /> Meadow knapweed Centaurea pratensis <br /> Mediterranean sage Salvia aethiopis <br /> Medusahead Taeniatherum caput-medusae <br /> Myrtle spurge Euphorbia myrsinites <br /> Orange hawkweed Hieracium aurantiacum <br /> Parrotfeather Myriophyllum aquaticum <br /> Purple loosestrife Lythrum salicada <br /> Rush skeletonweed Chondrilla juncea <br /> Squarrose knapweed Centaurea virgata <br /> Tansy ragwort Senecio jacobaea <br /> Yellow starthistle Centaurea solstitialis <br /> Colorado List B <br /> Tucson South Sand and Gravel Mine—Brighton,Colorado 3 <br />