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List B (Part 1)
List B (Part 2)
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Colorado Noxious Weeds - List B (Part 1)

These noxious weed species are the ones for which the Commissioner, in consultation with the state noxious weed advisory committee, local governments, and other interested parties, develops and implements state noxious weed management plans designed to stop the continued spread of these species. These species must be managed in accordance with all the provisions of the rules, including any applicable state noxious weed management plans. Until a plan for a particular species is developed and implemented by rule, all persons are recommended to manage that species.

Absinth wormwood (Artemisia absinthium)
Absinth wormwood (Artemisia absinthium)
Black henbane (Hyoscyamus niger)
Black henbane (Hyoscyamus niger)
Bouncingbet (Saponaria officinalis)
Bouncingbet (Saponaria officinalis)
Bull thistle (Cirsium vulgare)
Bull thistle (Cirsium vulgare)
Canada thistle (Cirsium arvense)
Canada thistle (Cirsium arvense)
Chinese clematis (Clematis orientalis)
Chinese clematis (Clematis orientalis)
Common tansy (Tanacetum vulgare)
Common tansy (Tanacetum vulgare)
Common teasel (Dipsacus fullonum)
Common teasel (Dipsacus fullonum)
Corn chamomile (Anthemis arvensis)
Corn chamomile (Anthemis arvensis)
Cutleaf teasel (Dipsacus laciniatus)
Cutleaf teasel (Dipsacus laciniatus)
Dalmatian toadflax, broad-leaved (Linaria dalmatica)
Dalmatian toadflax, broad-leaved (Linaria dalmatica)
Dalmatian toadflax, narrow-leaved (Linaria genistifolia)
Dalmatian toadflax, narrow-leaved (Linaria genistifolia)
Dame's rocket (Hesperis matronalis)
Dame's rocket (Hesperis matronalis)
Diffuse knapweed (Centaurea diffusa)
Diffuse knapweed (Centaurea diffusa)
Eurasian watermilfoil (Myriophyllum spicatum)
Eurasian watermilfoil (Myriophyllum spicatum)
Hoary cress (Cardaria draba)
Hoary cress (Cardaria draba)
Houndstongue (Cynoglossum officinale)
Houndstongue (Cynoglossum officinale)
Leafy spurge (Euphorbia esula)
Leafy spurge (Euphorbia esula)