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Hoary Cress (Cardaria draba) — rhizomatous perennial <br />Houndstongue (Cynoglossum officinale) — biennial* <br />Leafy Spurge (Euphorbia esula) — rhizomatous perennial* <br />Musk Thistle (Carduus nutans) — biennial <br />Moth Mullein (Verbascum blattaria) — biennial <br />Russian Olive (Elaeagnus angustifolia) — tree <br />Scentless Chamomile (Tripleurospermum perforatum) -annual <br />Scotch Thistle (Onopordum acanthium) — biennial <br />Sulfur Cinquefoil (Potentilla recta) — perennial <br />List C species occurring within the City of Louisville: <br />Cheatgrass or Downy Brome (Bromus tectorum) — winter annual <br />Chicory (Cichorium intybus) — rhizomatous perennial <br />Common Burdock (Arctium minus) — biennial <br />Common Mullein (Verbascum Thapsus) — biennial <br />Field Bindweed (Convulvulus arvensis) — rhizomatous perennial <br />Puncturevine (Tribulus terrestris) — annual* <br />Redstem Filaree (Erodium cicutarium) — winter annual or biennial <br />Watch List (these noxious weeds are List A species which have been identified in <br />Boulder County and could appear in Louisville) <br />Hairy Willow -herb (Epilobium hirsutum) — rhizomatous perennial <br />Mediterranean Sage (Salvia aethiopis) — biennial or perennial <br />Other Nuisance Weed Species within the City of Louisville (sometimes controlled) <br />American Pondweed (Potamogeton epihydrus) — rhizomatous <br />perennial submersed aquatic <br />Common Mallow (Malva neglecta)- annual <br />Curly Dock (Rumex crispus) — perennial <br />Dandelion (Taraxacum officincale) — perennial <br />Broadleaf Plantain (Plantago major) - perennial <br />Prickly Lettuce (Lactuca serriola) — annual or biennial <br />Russian Thistle (Kali tragus) — annual <br />White Clover (Trifolium repens) - perennial <br />Integrated Weed Management Plan 15 <br />19 <br />