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

All populations of these species in Colorado are designated by the Commissioner for eradication. It is a violation of the rules to allow any plant of any population of any List A species to produce seed or develop other reproductive propagules.
African rue (Peganum harmala)
African rue (Peganum harmala)		 Camelthorn (Alhagi pseudalhagi)
Camelthorn (Alhagi pseudalhagi)		 Common crupina (Crupina vulgaris)Common crupina (Crupina vulgaris)
Cypress spurge (Euphorbia cyparissias)
Cypress spurge (Euphorbia cyparissias)		 Dyer's woad (Isatis tinctoria)
Dyer's woad (Isatis tinctoria)		 Giant salvinia (Salvinia molesta)
Giant salvinia (Salvinia molesta)
Hydrilla (Hydrilla verticillata)
Hydrilla (Hydrilla verticillata)		 Meadow knapweed (Centaurea pratensis)
Meadow knapweed (Centaurea pratensis)		 Mediterranean sage (Salvia aethiopis)
Mediterranean sage (Salvia aethiopis)
Medusahead (Taeniatherum caput-medusae)
Medusahead (Taeniatherum caput-medusae)
Myrtle spurge (Euphorbia myrsinites)
Myrtle spurge (Euphorbia myrsinites)		 Orange hawkweed (Hieracium aurantiacum)Orange hawkweed (Hieracium aurantiacum)
Purple loosestrife (Lythrum salicaria)
Purple loosestrife (Lythrum salicaria)		 Rush skeletonweed (Chondrilla juncea)
Rush skeletonweed (Chondrilla juncea)		 Sericea lespedeza (Lespedeza cuneata)
Sericea lespedeza (Lespedeza cuneata)
Squarrose knapweed (Centaurea virgata)
Squarrose knapweed (Centaurea virgata)		 Tansy ragwort (Senecio jacobaea)
Tansy ragwort (Senecio jacobaea)		 Yellow starthistle (Centaurea solstitialis)
Yellow starthistle (Centaurea solstitialis)