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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 paniculata) <br /> Caucasian bluestem (Bothriochloa bladhii) <br /> Common bugloss (Anchusa officinalis) <br /> Common reed (Phrogmites australis) <br /> Garden loosestrife (Lysimachia vulgaris) <br /> Garlic mustard (Alliaria petiolota) <br /> Himalayan blackberry (Rubus armeniocus) <br /> Hoary alyssum (Berteroo incona Q <br /> Meadow hawkweed (Hieracium caespitosum) <br /> Onionweed (Asphodelus fistulosus) <br /> Siberian elm (Ulmus pumilo) <br /> Scotch broom (Cytisus scoparius) <br /> Swainsonpea (Sphaerophysa salsula) <br /> Syrian beancaper (Zygophyllum fabago) <br /> Tree of Heaven (Ailanthus altissima) <br /> Ventenata grass (Ventenata dubia) <br /> White bryony (Bryonia alba) <br /> Yellow bluestem (Bothriochloa ischaemum) <br /> Yellow flag iris (Iris pseudacorus) <br />