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Colorado Noxious Weeds (including Watch List), effective June, 2020 <br /> Watch List Species (19) <br /> Common Scientific <br /> Baby's breath (Gypsophila poniculoto) <br /> Caucasian bluestem (Bothriochloo blodhii) <br /> Common bugloss (Anchusa officinalis) <br /> Common reed (Phrogmites austrolis) <br /> Garden loosestrife (Lysimochia vulgoris) <br /> Garlic mustard (Alliaria petiolate) <br /> Himalayan blackberry (Rubus ormeniocus) <br /> Hoary alyssum (Berteroa incono L.) <br /> Meadow hawkweed (Hieracium coespitosum) <br /> Onionweed (Asphodelus fistulosus) <br /> Siberian elm (Ulmus pumilo) <br /> Scotch broom (Cytisus scoporius) <br /> Swainsonpea (Sphoerophyso salsulo) <br /> Syrian beancaper (Zygophyllum fabago) <br /> Tree of Heaven (Ailonthus altissima) <br /> Ventenata grass (Ventenata dubia) <br /> White bryony (Bryonia albo) <br /> Yellow bluestem (Bothriochloa ischaemum) <br /> Yellow flag iris (Iris pseudacorus) <br />