Alert List
The Alert List focuses on the invasive species that are rare to non-existent in the state and that pose the greatest threat to Colorado. These are the plants in which the public and land managers should be on the look out for and report if seen.
Alert List: is 18 species on the List A of the Noxious Weed Act and Red Alert Species assessed as posing a high threat to Colorado Lands.
-
If you find an alert list specie plant, please fill in the spotter form
-
To add a plant to the alert list, go through the Plant Assessment Form and send in to the Noxious Weed Program
Stay tuned for updates to this page
List A species in Colorado that are designated by the Commissioner for eradication:
African rue (Peganum harmala) *
Camelthorn (Alhagi pseudalhagi) *
Common crupina (Crupina vulgaris) *
Cypress spurge (Euphorbia cyparissias)
Dyer's woad (Isatis tinctoria)
Giant salvinia (Salvinia molesta) *
Hydrilla (Hydrilla verticillata) *
Meadow knapweed (Centaurea pratensis)
Mediterranean sage (Salvia aethiopis)
Medusahead (Taeniatherum caput-medusae) *
Myrtle spurge (Euphorbia myrsinites)
Orange hawkweed (Hieracium aurantiacum)
Purple loosestrife (Lythrum salicaria)
Rush skeletonweed (Chondrilla juncea) *
Sericea lespedeza (Lespedeza cuneata) *
Squarrose knapweed (Centaurea virgata) *
Tansy ragwort (Senecio jacobaea)
Yellow starthistle (Centaurea solstitialis)
* Not yet known to be in Colorado.
Giant knotweed (Polygonum sachalinense)
Himilayan knotweed (Polygonum polystachyum)
Japanese knotweed (Polygonum cuspidatum) Plant Assessment Form (PDF)
Garlic Mustard (Alliaria petiolata) Garlic mustard Plant Assessment Form (PDF)
Factsheets are not yet available for the above, below are some good links for additional resources.
Japanese knotweed information:
http://plants.usda.gov/java/profile?symbol=POCU6
http://tncweeds.ucdavis.edu/moredocs/polspp01.pdf
http://www.kingcounty.gov/environment/animalsAndPlants/noxious-weeds/weed-identification/invasive-knotweeds/japanese-knotweed.aspx
Garlic mustard information:
http://www.nps.gov/plants/ALIEN/fact/alpe1.htm