Appendix G Noxious Weed Species

Appendix G — Noxious Weed Species

Table G–1 Noxious Weed Lists (State of Colorado, La Plata County, and Archuleta County) Common Name Scientific Name Colorado State List1 La Plata County List Archuleta County List Absinth wormwood Artemisia absinthium A, C African rue Peganum harmala A, C Black henbane Hyoscyamus niger A Black nightshade Solanum nigrum A Blue flax Linum perenne n/a Potential invader Blue mustard Chorispora tenella A Bouncingbet Saponaria officinalis A, C Bull thistle Cirsium vulgare A Υ Camelthorn Alhagi pseudalhagi A, C Chamomile Matricaria perforata n/a Recommended control Canada thistle Cirsium arvense A, B Recommended control Υ Chicory Cichorium intybus A Chinese clematis Clematis orientalis A Coast tarweed Madia sativa A, C Common burdock Arctium minus A Common crupina Crupina vulgaris A, C Common groundsel Senecio vulgaris A Common mullein Verbascum thapsus A Common St. Johnswort Hypericum perforatum A Common tansy Tanacetum vulgare A Common teasel Dipsacus fullonum A, C Cypress spurge Euphorbia cyparissias A, C

G–1 NSJB CBM FEIS Appendix G — Noxious Weed Species

Table G–1 Noxious Weed Lists (State of Colorado, La Plata County, and Archuleta County) Common Name Scientific Name Colorado State List1 La Plata County List Archuleta County List Dalmatian toadflax, broad-leaved Linaria dalmatica A, B Mandatory control Υ Dalmation toadflax, narrow-leaved Linaria genistifolia A, B Mandatory control Υ Dame's rocket Hesperis matronalis A Potential invader Diffuse knapweed Centaurea diffusa A, B Mandatory control, Potential Υ invader Downy brome (cheat grass) Bromus tectorum A Dyer's woad Isatis tinctoria A, C Eurasian water milfoil Myriophyllum spicatum A, C Field bindweed Convolvulus arvensis A, B Recommended control Flixweed Descurainia sophia A Giant salvinia Salvinia molesta A, C Green foxtail Setaria viridis A Hairy nightshade Solanum sarrachoides A Halogeton Halogeton glomeratus A Hoary cress Cardaria draba A, B Recommended control Υ Houndstongue Cynoglossum officinale A, B Recommended control Υ Hydrilla Hydrilla hydrilla A, C Johnsongrass Sorghum halepense A Jointed goatgrass Aegilops cylindrica A Kochia Kochia scoparia A Leafy spurge Euphorbia esula A, B Mandatory control Υ Mayweed chamomile Anthemis cotula A Meadow knapweed Centaurea pratensis A, C Mediterranean sage Salvia aethiopis A, C Medusahead rye Taeniatherum caput-medusae A, C Moth mullein Verbascum blattaria A, C Musk thistle Carduus nutans A, B Recommended control Υ Myrtle spurge Euphorbia myrsinites A, C

G–2 NSJB CBM FEIS Appendix G — Noxious Weed Species

Table G–1 Noxious Weed Lists (State of Colorado, La Plata County, and Archuleta County) Common Name Scientific Name Colorado State List1 La Plata County List Archuleta County List Orange hawkweed Hieracium aurantiacum A, C Potential invader Oxeye daisy Chrysanthemum leucanthemum A Recommended control Perennial pepperweed Lepidium latifolium A Υ Perennial sowthistle Sonchus arvensis A Plumeless thistle Carduus acanthoides A Υ2 Poison hemlock Conium maculatum A Puncturevine Tribulus terrestris A Purple loosestrife Lythrum salicaria A Mandatory control, Potential Υ2 invader Quackgrass Elytrigia repens A Redstem filaree Erodium cicutarium A Rush skeletonweed Chondrilla juncea A, C Russian knapweed Centaurea repens A, B Mandatory control Υ Russian-olive Elaeagnus angustifolia A Russian thistle Salsola collina and S. iberica A Saltcedar Tamarix parviflora and T. ramosissima A Scentless chamomile Anthemis arvensis A Scotch thistle Onopordum acanthium and O. tauricum A Recommended control Υ Sericea lespedeza Lespedeza cuneata A, C Shepherdspurse Capsella bursa-pastoris A Spotted knapweed Centaurea maculosa A Mandatory control Υ Spurred anoda Anoda cristata A, C Squarrose knapweed Centaurea virgata A, C Potential invader Sulfur cinquefoil Potentilla recta A, C Potential invader Swainsonpea Sphaerophysa salsula A Tansy ragwort Senecio jacobaea A, C Velvetleaf Abutilon theophrasti A Venice mallow Hibiscus trionum A, C

G–3 NSJB CBM FEIS Appendix G — Noxious Weed Species

Table G–1 Noxious Weed Lists (State of Colorado, La Plata County, and Archuleta County) Common Name Scientific Name Colorado State List1 La Plata County List Archuleta County List Wild caraway Carum carvi A Wild mustard Brassica kaber A Wild oats Avena fatua A Wild proso millet Panicum miliaceum A Yellow foxtail Setaria glauca A Yellow nutsedge Cyperus esculentus A Yellow starthistle Centaurea solstitialis A, C Potential invader Yellow toadflax Linaria vulgaris A, B Mandatory control Υ Notes: 1. A: These weed species are identified as State Noxious Weeds. They have been identified by individual counties as problem weeds in the county’s area or have been recommended for management through public testimony. These weed species should be considered by each local advisory board and local governing body in the development, adoption, and enforcement of their noxious weed list and noxious weed management plan. B: These weed species are recognized as the top ten prioritized weed species for the State of Colorado. After analysis of a statewide survey of counties, these species are acknowledged to be the most widespread and to cause the greatest economic impact in the State of Colorado. These species shall be considered by each local advisory board and local governing body in the development, adoption, and enforcement of their noxious weed list and noxious weed management plan. C: These weed species may not be present or are not yet widespread or causing great economic impact within the State of Colorado. However, counties and local advisory boards are encouraged to contain and eradicate these species before they proliferate and significantly impact the economic and environmental values of the lands of the State. 2. Not yet identified in Archuleta County, but a real threat.

G–4 NSJB CBM FEIS