Watch List

The Colorado Watch List pdf file consists of 22 species that have been determined to pose a potential threat to the agricultural productivity and environmental values of the lands of the state and require careful observation. Many species included on this list are not yet known to occur in the state but have been recognized as noxious or problematic by another state or states in the region. For the included species that do occur in Colorado, more information is needed about the distribution and effect on agricultural and natural lands in the state.

If you find a population of one of the Watch List species, please fill out the Spotter Form.

 

Watch List Species

Asian mustard © Lara Hartley

Asian mustard 
Brassica tournefortii

 

Babys Breath © Richard Old

Baby's breath
Gypsophila paniculata

 

Spiny_cocklebur_005 © John Randall 

Bathurst burr/
Spiney cocklebur

Xanthium spinosum

 

Brazilian_elodea_005 

Brazilian Elodea
Egeria densa

Common bugloss © J.S. Peterson 

Common bugloss
Anchusa officinalis

 

Common reed © Leslie Mehroff

Common reed
Phragmites australis

 

Flowering rush © Louis Landry

Flowering rush
Butomus umbellatus

 

Hairy willow-herb © Richard Old

Hairy willow-herb
Epilobium hirsutum

Himalayan blackberry © John Randall

Himalayan blackberry
Rubus armeniacus

 

Congongrass © Charles Bryson USDA

Japanese blood grass/
cogongrass

Imperata cylindrical

 

Meadow hawkweed © Richard Old

Meadow hawkweed
Hieracium caespitosum

 

Onionweed © William Ciesla 

Onionweed 
Asphodelus fistulosus

 Parrotfeather_005 

Parrotfeather 
Myriophyllum aquaticum

 

Purple pampasgrass © John DiTomaso

Purple Pampasgrass
Cortideria jubata

 

Scotch broom © Eric Coombs

Scotch broom
Cytisus scoparius

 

Sericea lespedeza © Dan Tenaglia

Sericea lespedeza
Lespedeza cuneata

Swainsonpea © Richard Old

Swainsonpea
Sphaerophysa salsula

 

Syrian beancaper © Dell Clark

Syrian beancaper
Zygophyllum fabago

 

Water hyacinth © Chris Evans

Water hyacinth
Eichhornia crassipes

 

Water lettuce © Richard Old

Water lettuce
Pistia stratiotes

White bryony © Jan Samanek

White bryony
Bryonia alba

 

Whoolly distaff thistle © Joseph DiTomaso

Woolly distaff thistle
Carthamus lanatus

 

Yellow flag iris © Patty York

Yellow flag iris
Iris pseudacorus

 

Yellow_floatingheart_005

Yellow floatingheart
Nymphoides peltata

Yellowtuft_005

Yellowtuft
Alyssum murale & A. corsicum