Coverage checklist

82 of 82 state-list entries have illustrated profiles. The guide contains 154 profiles and 462 distinct photographs overall.

Baseline: Colorado noxious-weed rule, effective 2025-05-15, parts 3.1, 4.1 and 5.1. Source checked 2026-09-07T01:07:48+00:00.

A finite regulatory baseline, not a claim to encompass every plant that could be considered a weed. Salt cedar is one listing row containing two named species. Hybrids retain separate rows.

Coverage means that a profile discusses the entry, with three source-identified photographs and explicit evidence limits. It does not mean every listed subspecies, hybrid or local population has been independently identified or that pet toxicology is complete.

What the state lists mean

These categories describe weed management requirements. They are separate from danger ratings for people, pets, livestock and other plants.

State list	Meaning
List A — Eradicate	Uncommon in Colorado. All populations are designated for eradication statewide.
List B — Stop the spread	Established in some areas. Requirements vary by location: eradication, containment or suppression to stop further spread.
List C — Manage widespread weeds	Widespread and well established. Control is recommended by the state; local governments may require management.

Source: Fremont-list-definitions: Weed Identification: Colorado List A, B and C definitions.

Beyond the state lists

Only the specified finite Corteva Western Rangeland guide and CSU Weed Descriptions article; not every page on either website. Missing topics are research candidates, not confirmed Colorado occurrences.

Compared publication	Topics	Fully matched	Partly represented	Still missing
CSU Weed Descriptions	37	36	1	0
Corteva Western Rangeland guide	84	50	7	27

Dedicated source topic, not species count or clinical completeness. Compound and genus topics remain partial until all named components are covered. Every plant page displays its research status; a profile is not a completed safety review. The full comparison and source records preserve each match and gap.

Next research candidates

These topics remain missing or partly covered. Colorado occurrence, exact identity and hazards need review before expansion.

Source	Topic	Coverage	Remaining taxa or groups
CSU Weed Descriptions	Wild Violet	partial	Viola spp.
Corteva Western Rangeland guide	Bitter sneezeweed	none	Helenium badium, Helenium amarum
Corteva Western Rangeland guide	Annual broomweed	none	Amphiachyris dracunculoides
Corteva Western Rangeland guide	Woolly croton / goatweed	none	Croton texensis
Corteva Western Rangeland guide	Cutleaf evening primrose	none	Oenothera laciniata
Corteva Western Rangeland guide	Fleabane	none	Erigeron annuus
Corteva Western Rangeland guide	Carolina geranium	none	Geranium carolinianum
Corteva Western Rangeland guide	Hemp	none	Cannabis sativa
Corteva Western Rangeland guide	Marshelder / sumpweed	none	Iva annua
Corteva Western Rangeland guide	Hedge and tumble mustard	partial	Sisymbrium officinale
Corteva Western Rangeland guide	Wild mustard	none	Sinapis arvensis
Corteva Western Rangeland guide	Spiny amaranth	none	Amaranthus spinosus
Corteva Western Rangeland guide	Common and giant ragweed	partial	UNRESOLVED giant ragweed label
Corteva Western Rangeland guide	Lanceleaf ragweed	none	Ambrosia bidentata
Corteva Western Rangeland guide	Prickly sida	none	Sida spinosa
Corteva Western Rangeland guide	Pennsylvania and tufted smartweed	none	Persicaria pensylvanica, Persicaria longiseta
Corteva Western Rangeland guide	Vetch	none	Vicia sativa
Corteva Western Rangeland guide	Western bitterweed / bitter rubberweed	none	Hymenoxys odorata, Hymenoxys richardsonii
Corteva Western Rangeland guide	Smooth and catchweed bedstraw	partial	Galium mollugo
Corteva Western Rangeland guide	Bull nettle	none	Cnidoscolus texanus
Corteva Western Rangeland guide	Dogfennel	none	Eupatorium capillifolium
Corteva Western Rangeland guide	Goldenrod	partial	Solidago spp.
Corteva Western Rangeland guide	Giant hogweed	none	Heracleum mantegazzianum
Corteva Western Rangeland guide	Carolina and western horsenettle	none	Solanum carolinense, Solanum dimidiatum
Corteva Western Rangeland guide	Tall and western ironweed	none	Vernonia gigantea, Vernonia baldwinii
Corteva Western Rangeland guide	Brown and spotted knapweed	partial	Centaurea jacea
Corteva Western Rangeland guide	Woolly locoweeds and crazyweeds	partial	Astragalus spp., Oxytropis spp.
Corteva Western Rangeland guide	Broadleaf and narrowleaf plantain	none	Plantago major, Plantago lanceolata
Corteva Western Rangeland guide	Sericea lespedeza	none	Lespedeza cuneata
Corteva Western Rangeland guide	Threadleaf groundsel	none	Senecio douglasii
Corteva Western Rangeland guide	Blue and hoary vervain	none	Verbena hastata, Verbena stricta
Corteva Western Rangeland guide	Wingstem	none	Verbesina alternifolia
Corteva Western Rangeland guide	Willows	none	Salix spp.
Corteva Western Rangeland guide	Rabbitbrush	partial	Chrysothamnus spp.
Corteva Western Rangeland guide	Buckbrush	none	Ceanothus cuneatus

List A — Eradicate · 27 entries

Uncommon in Colorado. All populations are designated for eradication statewide.

State listing	Listed scientific name	Illustrated profile	Mapping and limits
African rue	Peganum harmala	African rue	Exact listing name.
Camelthorn	Alhagi maurorum	Camelthorn	Exact listing name.
Common crupina	Crupina vulgaris	Common crupina	Exact listing name.
Cypress spurge	Euphorbia cyparissias	Cypress spurge	Exact listing name.
Dyer's woad	Isatis tinctoria	Dyer’s woad	Exact listing name.
Elongated mustard	Brassica elongata	Elongated mustard	Exact listing name.
Flowering rush	Butomus umbellatus	Flowering rush	Exact listing name.
Giant reed	Arundo donax	Giant reed	Exact listing name.
Giant salvinia	Salvinia molesta	Giant salvinia	Exact listing name.
Hairy willow-herb	Epilobium hirsutum	Hairy willow-herb	Exact listing name.
Hydrilla	Hydrilla verticillata	Hydrilla	Exact listing name.
Japanese knotweed	Fallopia japonica	Japanese knotweed	Synonym, spelling or taxon-scope mapping; see profile caveat.
Giant knotweed	Fallopia sachalinense	Giant knotweed	Synonym, spelling or taxon-scope mapping; see profile caveat.
Bohemian knotweed	Fallopia x bohemicum	Bohemian knotweed	Synonym, spelling or taxon-scope mapping; see profile caveat.
Meadow knapweed	Centaurea x moncktonii	Meadow knapweed	Synonym, spelling or taxon-scope mapping; see profile caveat.
Mediterranean sage	Salvia aethiopis	Mediterranean sage	Exact listing name.
Medusahead	Taeniatherum caput-medusae	Medusahead	Exact listing name.
Myrtle spurge	Euphorbia myrsinites	Myrtle spurge	Exact listing name.
Orange hawkweed	Hieracium aurantiacum	Orange hawkweed	Synonym, spelling or taxon-scope mapping; see profile caveat.
Parrotfeather	Myriophyllum aquaticum	Parrotfeather	Exact listing name.
Purple loosestrife	Lythrum salicaria	Purple loosestrife	Exact listing name.
Rush skeletonweed	Chondrilla juncea	Rush skeletonweed	Exact listing name.
Squarrose knapweed	Centaurea virgata	Squarrose knapweed	Exact listing name.
Tansy ragwort	Senecio jacobaea	Tansy ragwort	Synonym, spelling or taxon-scope mapping; see profile caveat.
Ventenata	Ventenata dubia	Ventenata	Exact listing name.
Yellow flag iris	Iris pseudacorus	Yellow flag iris	Exact listing name.
Yellow starthistle	Centaurea solstitialis	Yellow starthistle	Exact listing name.

List B — Stop the spread · 37 entries

Established in some areas. Requirements vary by location: eradication, containment or suppression to stop further spread.

State listing	Listed scientific name	Illustrated profile	Mapping and limits
Absinth wormwood	Artemisia absinthium	Absinth wormwood	Exact listing name.
Black henbane	Hyoscyamus niger	Black henbane	Exact listing name.
Bouncingbet	Saponaria officinalis	Bouncingbet	Exact listing name.
Bull thistle	Cirsium vulgare	Bull thistle	Exact listing name.
Canada thistle	Cirsium arvense	Canada thistle	Exact listing name.
Chinese clematis	Clematis orientalis	Chinese clematis	Exact listing name.
Common tansy	Tanacetum vulgare	Common tansy	Exact listing name.
Common teasel	Dipsacus fullonum	Common teasel	Exact listing name.
Cutleaf teasel	Dipsacus laciniatus	Cutleaf teasel	Exact listing name.
Dalmatian toadflax, broad-leaved	Linaria dalmatica	Dalmatian toadflax	Exact listing name.
Dalmatian toadflax, narrow-leaved	Linaria genistifolia	Narrow-leaved Dalmatian toadflax	Exact listing name.
Dame's rocket	Hesperis matronalis	Dame’s rocket	Exact listing name.
Diffuse knapweed	Centaurea diffusa	Diffuse knapweed	Exact listing name.
Eurasian watermilfoil	Myriophyllum spicatum	Eurasian watermilfoil	Exact listing name.
Hoary cress	Lepidium draba	Hoary cress	Exact listing name.
Houndstongue	Cynoglossum officinale	Houndstongue	Exact listing name.
Jointed goatgrass	Aegilops cylindrica	Jointed goatgrass	Exact listing name.
Leafy spurge	Euphorbia esula	Leafy spurge	Exact listing name.
Mayweed/stinking chamomile	Anthemis cotula	Mayweed chamomile	Exact listing name.
Moth mullein	Verbascum blattaria	Moth mullein	Exact listing name.
Musk thistle	Carduus nutans	Musk thistle	Exact listing name.
Oxeye daisy	Leucanthemum vulgare	Oxeye daisy	Exact listing name.
Perennial pepperweed	Lepidium latifolium	Perennial pepperweed	Exact listing name.
Plumeless thistle	Carduus acanthoides	Plumeless thistle	Exact listing name.
Russian knapweed	Rhaponticum repens	Russian knapweed	Exact listing name.
Russian-olive	Elaeagnus angustifolia	Russian olive	Exact listing name.
Salt cedar	Tamarix chinensis and T. ramosissima	Tamarisk	One state listing covers T. chinensis and T. ramosissima. The profile discusses the saltcedar group; photographs are source-identified T. ramosissima and do not separately resolve T. chinensis or hybrids.
Scentless chamomile	Tripleurospermum inodorum	Scentless chamomile	Exact listing name.
Scotch thistle	Onopordum acanthium	Scotch thistle	Exact listing name.
Scotch thistle	Onopordum tauricum	Taurian thistle	Exact listing name.
Spotted knapweed	Centaurea stoebe ssp.micranthos	Spotted knapweed	The state names ssp. micranthos; the illustrated profile uses C. stoebe broadly and does not independently verify chromosome/subspecies identity.
Spotted x diffuse knapweed hybrid	Centaurea x psammogena	Spotted × diffuse knapweed hybrid	Synonym, spelling or taxon-scope mapping; see profile caveat.
Sulfur cinquefoil	Potentilla recta	Sulfur cinquefoil	Exact listing name.
Wild caraway	Carum carvi	Wild caraway	Exact listing name.
Yellow nutsedge	Cyperus esculentus	Yellow nutsedge	Exact listing name.
Yellow toadflax	Linaria vulgaris	Yellow toadflax	Exact listing name.
Yellow x Dalmatian toadflax hybrid	Linaria vulgaris x L. dalmatica	Yellow × Dalmatian toadflax hybrid	Synonym, spelling or taxon-scope mapping; see profile caveat.

List C — Manage widespread weeds · 18 entries

Widespread and well established. Control is recommended by the state; local governments may require management.

State listing	Listed scientific name	Illustrated profile	Mapping and limits
Bulbous bluegrass	Poa bulbosa	Bulbous bluegrass	Exact listing name.
Chicory	Cichorium intybus	Chicory	Exact listing name.
Common burdock	Arctium minus	Common burdock	Exact listing name.
Common mullein	Verbascum thapsus	Common mullein	Exact listing name.
Common St. Johnswort	Hypericum perforatum	Common St. Johnswort	Exact listing name.
Downy brome	Bromus tectorum	Cheatgrass / downy brome	Exact listing name.
Field bindweed	Convolvulus arvensis	Field bindweed	Exact listing name.
Halogeton	Halogeton glomeratus	Halogeton	Exact listing name.
Johnsongrass	Sorghum halepense	Johnsongrass	Exact listing name.
Perennial sowthistle	Sonchus arvensis	Perennial sowthistle	Exact listing name.
Poison hemlock	Conium maculatum	Poison hemlock	Exact listing name.
Puncturevine	Tribulus terrestris	Puncturevine / goathead	Exact listing name.
Quackgrass	Elymus repens	Quackgrass	Exact listing name.
Redstem filaree	Erodium cicutarium	Redstem filaree	Exact listing name.
Siberian elm	Ulmus pumila	Siberian elm	Exact listing name.
Tree of heaven	Ailanthus altissima	Tree of heaven	Exact listing name.
Velvetleaf	Abutilon theophrasti	Velvetleaf	Exact listing name.
Wild proso millet	Panicum miliaceum	Wild proso millet	Exact listing name.

Still open

County-by-county occurrence and abundance are not mapped.
Common and native weeds beyond this catalog remain to be added; this is not the entire Colorado flora.
Some species complexes, subspecies and hybrids need expert verification; image identity follows the credited source.
Species-specific pet toxicology is missing for many plants and is labeled in each profile.
One hybrid-toadflax flower photograph is only 176 by 329 pixels.
The wild-violet genus is represented by one species, and several manufacturer topics combine species still missing from this guide. The comparison is a research backlog, not evidence that every missing plant occurs in Colorado.

Content revised 2026-09-21 19:48:00Z · Source checks dated separately in the references.

Read with an AI assistant · Markdown and sources

Markdown: https://denson.github.io/colorado-weed-field-guide/coverage/index.md
Text fallback: https://denson.github.io/colorado-weed-field-guide/coverage/index.md.txt
Start here: https://denson.github.io/colorado-weed-field-guide/start.md
Source ledger: https://denson.github.io/colorado-weed-field-guide/provenance.json