Colorado Department of Agriculture
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Noxious Weed Images

Noxious Weed Management Program

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ABSINTH WORMWOOD
Scientific name:  Artemisia absinthium  

Photos: Chris Evans, Univeristy of Georgia, www.forestryimages.com & Kelly Uhing
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Absinth wormwood fact sheet (PDF)            

Picture of absinth wormwood bush courtesy of forestryimages.com Picture of Absinth Wormwood courtesy of North Dakota State University Picture of Absinth Wormwood courtesy of North Dakota State University



AFRICAN RUE
Scientific name:  Peganum harmala

Photos: CSU Extension, Kelly Uhing, Adams County Weed Program
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African rue Fact Sheet (PDF)                       

Picture of African Rue Flower and Buds African Rue Picture with foilage and flower Picture of African Rue Flower and Buds



BLACK HENBANE
Scientific name:  Hyoscyamus niger

Photos: Kelly Uhing & Mary Ellen Harte, www.forestryimages.com 
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Black henbane fact sheet (PDF)

Close up picture of a black henbane flower. Picture of a Black Henbane Noxious Weed A picture of black henbane, a Colorado noxious weed A picture of black henbane, a Colorado noxious weed



BOUNCING BET
Scientific name:  Saponaria officinalis

Photos: Kelly Uhing & Dave Powell, USDA Forest Service, www.forestryimages.com
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Bouncing bet fact sheet (PDF)

Picture of Bouncingbet, State Noxious Weed Picture of Bouncingbet, courtesy of www.forestryimages.com Picture of Bouncingbet Picture of Bouncingbet



BULL THISTLE
Scientific name:  Cirsium vulgare

Photos: Kelly Uhing & Steve Dewey, Utah State University & UAF Cooperative Extension Archives, University of Alaska; www.forestryimages.com
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Bull thistle fact sheet (PDF)

Picture of Bull Thistle Close up picture of Bull Thistle, courtesy of www.forestryimages.com Close up picture of Bull Thistle seedling, courtesy of www.forestryimages.com Close up picture of Bull Thistle seedling, courtesy of www.forestryimages.com



CAMELTHORN
Scientific name:  Alhagi pseudalhagi

Photos: www.smvma.org & www.agric.wa.gov
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Camelthorn fact sheet (PDF)     

Close up picture of Camelthorn Picture of Camelthorn Close up picture of Camelthorn



CANADA THISTLE
Scientific name:  Cirsium arvense

Photos: Kelly Uhing & Steve Dewey, Utah State University & Chris Evans, University of Georgia; www.forestryimages.com
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Canada thistle fact sheet (PDF)

Picture of Canada Thistle Picture of Canada Thistle, close up courtesy of Steve Dewey Utah State University Picture of Canada Thistle, close up courtesy of Chris Evans Picture of Canada Thistle



CHICORY
Scientific name:  Cichorium intybus

Photos: Kelly Uhing & Chris Evans, University of Georgia & David Cappaert, US Forest Service; www.forestryimages.com
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Picture of Chicory Picture of Chicory Picture of Chicory, close up courtesy of Kelly Uhing.



CHINESE CLEMATIS
Scientific name:  Clematis orientalis

Photos: Kelly Uhing & Irene Shonle, Colorado State University Extension
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Chinese clematis fact sheet (PDF)             

Picture of yellow chinese clamatis Picture of yellow chinese clamatis Picture of yellow chinese clamatis Picture of yellow chinese clamatis



COAST TARWEED
Scientific name:  Madia sativa

Photos:  www.berkeley.edu & www.stanford.edu
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Coast tarweed, courtesy of Berkely Coast tarweed, courtesy of Stanford.edu



COMMON BURDOCK
Scientific name:  Arctium minus

Photos: Kelly Uhing
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Common burdock, photo courtesy of Kelly Uhing Common burdock, photo courtesy of Kelly Uhing Common burdock, photo courtesy of Kelly Uhing



COMMON CRUPINA
Scientific name:  Crupina vulgaris

Photos: Steve Dewey, Utah State University; USDA APHIS PPQ Archives, USDA APHIS; Utah State University Archives; www.forestryimages.com
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Common crupina fact sheet (PDF)

Common Crupina, photo courtesy of forestryimages.com Common Crupina, photo courtesy of forestryimages.com Common Crupina, photo courtesy of forestryimages.com Common Crupina, photo courtesy of forestryimages.com



COMMON GROUNDSEL
Scientific name:  Senecio vulgaris

Photos: Steve Dewey, Utah State University, & John Byrd www.forestryimages.com .
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Common Groundsel, photo courtesy of forestryimages.com Common Groundsel, photo courtesy of John Byrd



COMMON MULLEIN
Scientific name: Verbascum thapsus

Photos: John D. Byrd, Mississippi State University & Mary Ellen Harte,  www.forestryimages.com & Kelly Uhing
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Common Mullein, photo courtesy of Mary Harte, forestryimages.com Common Mullein, photo courtesy of Mary Harte, forestryimages.com Common Mullein, photo courtesy of John Byrd, forestryimages.com Common Mullein, photo courtesy of Kelly Uhing



COMMON ST. JOHNSWORT
Scientific name:  Hypericum perforatum

Photos by: Steve Dewey, Utah State University & Michael Shephard, USDA Forest Service;
www.forestryimages.com & Kelly Uhing
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Common St.Johnswort, photo courtesy of Steve Dewey, forestryimages.com Common St.Johnswort, photo courtesy of Michael Shepard, forestryimages.com Common St.Johnswort, photo courtesy of Kelly Uhing


COMMON TANSY
Scientific name:  Tanacetum vulgare

Photos: Kelly Uhing
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Common tansy fact sheet (PDF)

A picture of Common Tansy, a noxious weed A picture of Common Tansy, a noxious weed A picture of Common Tansy, a noxious weed



COMMON TEASEL
Scientific name:  Dipsacus fullonum

Photos: Steve Dewey, Utah State University, www.forestryimages.com & Kelly Uhing 
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Common teasel fact sheet (PDF)

A picture of Common Teasel, a noxious weed A picture of Common Teasel, a noxious weed A picture of Common Teasel, a noxious weed A picture of Common Teasel, a noxious weed



CORN CHAMOMILE

Photos: Unknown
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Corn chamomile fact sheet (PDF)

Photo of a Corn Chamomile, a Colorado Noxious Weed Photo of a Corn Chamomile, a Colorado Noxious Weed



CUTLEAF TEASEL

Photos: Unknown
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Cutleaf Teasel fact sheet (PDF)

Photo of a Cutleaf Teasel, a Colorado Noxious Weed Photo of a Cutleaf Teasel, a Colorado Noxious Weed Photo of a Cutleaf Teasel, a Colorado Noxious Weed Photo of a Cutleaf Teasel, a Colorado Noxious Weed Photo of a Cutleaf Teasel, a Colorado Noxious Weed Photo of a Cutleaf Teasel, a Colorado Noxious Weed



CYPRESS SPURGE
Scientific name:  Euphorbia cyparissias

Photos: Kelly Uhing, Colorado Department of Agriculture; Richard Casagrande, University of Rhode Island; and Todd Pfeiffer, Klamath County Weed Control. 

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Cypress spurge fact sheet (PDF)

A picture of Cypress Spurge, a noxious weed A picture of Cypress Spurge, a noxious weed A picture of Cypress Spurge, a noxious weed



DALMATIAN TOADFLAX
Scientific name:  Linaria dalmatica (broadleaf) & Linaria genistifoila (narrowleaf)

Photos: Adams County Colorado, Steve Dewey, Utah State University, & Kelly Uhing TOP                    
Dalmatian toadflax fact sheet (PDF)

A picture of Dalmatian Toadflax, a noxious weed A picture of Dalmatian Toadflax, a noxious weed A picture of Dalmatian Toadflax, a noxious weed A picture of Dalmatian Toadflax, a noxious weed



DAME'S ROCKET
Scientific name:  Hesperis matronalis

Photos: www.dnr.state.wi.us & Colorado State University Cooperative Extension, Kelly Uhing, Colorado Department of Agriculture; Richard Olds XID Services; Tom Huette, USDA Forest Service.
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Dame's rocket fact sheet (PDF)

A picture of Dame's Rocket, a noxious weed A picture of Dame's Rocket, a noxious weed A picture of Dame's Rocket, a noxious weed A picture of Dame's Rocket, a noxious weed



DIFFUSE KNAPWEED
Scientific name:  Centaurea diffusa

Photo: Kelly Uhing
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Diffuse knapweed fact sheet (PDF)               

A picture of Diffuse Knapweed, a noxious weed A picture of Diffuse Knapweed, a noxious weed A picture of Diffuse Knapweed, a noxious weed



DOWNY BROME (CHEATGRASS)
Scientific name:  Bromus tectorum

Photos by: Chris Evans, University of Georgia & Tom Heutte, USDA Forest Service; www.forestryimages.com
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A picture of Downy Brome A picture of Downy Brome A picture of Downy Brome



DYER'S WOAD
Scientific name:  Isatis tinctoria

Photos by: Steve Dewey, Utah State University, www.forestryimages.com
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Dyer's woad fact sheet (PDF)          

A picture of Dyer's Woad, a noxious weed A picture of Dyer's Woad, a noxious weed A picture of Dyer's Woad, a noxious weed A picture of Dyer's Woad, a noxious weed

 


ELONGATED MUSTARD
Scientific name: Brassica elongata

  Elongated Mustard fact sheet (PDF)

Photo by
Rachel Winston,
MIA Consulting
Photo by
Larry Walker,
Chaffee County Weed Department
Photo by
Larry Walker,
Chaffee County Weed Department

A picture of Elongated Mustard, a noxious weed

A picture of Elongated Mustard, a noxious weed

A picture of Elongated Mustard, a noxious weed

 



EURASIAN WATERMILFOIL
Scientific name:  Myriophyllum spicatum

Photos: Kelly Uhing
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Eurasian watermilfoil fact sheet (PDF)

A picture of Eurasian Watermilfoil, a noxious weed A picture of Eurasian Watermilfoil, a noxious weed A picture of Eurasian Watermilfoil, a noxious weed A picture of Eurasian Watermilfoil, a noxious weed



FIELD BINDWEED
Scientific name:  Convolvulus arvensis

Photos by: Kelly Uhing  
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Field bindweed fact sheet (PDF)

A picture of Field Bindweed, a noxious weed A picture of Field Bindweed, a noxious weed A picture of Field Bindweed, a noxious weed A picture of Field Bindweed, a noxious weed



FLIXWEED
Scientific name:  Descurainia sophia

Photos by: Tom Heutte, USDA Forest Service & Mary Ellen Harte, www.forestryimages.com
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A picture of Flixweed, a noxious weed A picture of Flixweed, a noxious weed A picture of Flixweed, a noxious weed



GARLIC MUSTARD
Scientific name:  Alliaria petiolata

Photos by: Kelly Uhing
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A picture of Garlic mustard, a noxious weed A picture of Garlic mustard, a noxious weed A picture of Garlic mustard, a noxious weed A picture of Garlic mustard, a noxious weed

 


GIANT REED
Scientific name:  Arundo donax

Photos: www.invasive.org and Cindy Lair (CDA)
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 Giant Reed Fact Sheet (PDF)

A picture of a Giant Reed seed head, a noxious weed A picture of a Giant Reed leaf collar detail, a noxious weed Giant Reed in an Urban setting

 


GIANT SALVINIA
Scientific name:  Salvinia molesta

Photos: Scott Bauer, USDA Agri Research Service; Scott Robinson, Georgia Department of Natural Resource, C.Jacono, USGS; Victor Ramey, University of Florida & Troy Evans; www.forestryimages.com
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Giant Salvinia Fact Sheet (PDF)

A picture of Giant Salvinia, a noxious weed A picture of Giant Salvinia, a noxious weed A picture of Giant Salvinia, a noxious weed A picture of Giant Salvinia, a noxious weed



GREEN FOXTAIL
Scientific name:  Setaria viridis

Photos: Steve Dewey, Utah State University & Wendy VanDyk Evans; www.forestryimages.com
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A picture of Green Foxtail, a noxious weed A picture of Green Foxtail, a noxious weed



HALOGETON
Scientific name:  Halogeton glomeratus

Photos by: Kelly Uhing
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A picture of Halogten, a noxious weed A picture of Halogten, a noxious weed A picture of Halogten, a noxious weed

 



HOARY CRESS
Scientific name:  Cardaria draba

Photos: Kelly Uhing
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Hoary cress fact sheet (PDF)

A picture of Hoary Cress, a noxious weed A picture of Hoary Cress, a noxious weed A picture of Hoary Cress, a noxious weed A picture of Hoary Cress, a noxious weed



HOUNDSTONGUE
Scientific name:  Cynoglossum officinate

Photo: Kelly Uhing, Colorado Department of Agriculture
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Houndstongue fact sheet (PDF)

Photo of a Houndstongue, a Colorado Noxious Weed Photo of a Houndstongue, a Colorado Noxious Weed Photo of a Houndstongue, a Colorado Noxious Weed Photo of a Houndstongue, a Colorado Noxious Weed



HYDRILLA
Scientific name:  Hydrilla verticillata

Photos: Alison Fox; USDA APHIS PPQ, & Chris Evans, University of Georgia, www.forestryimages.com
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Hydrilla fact sheet (PDF)

A picture of Hydrilla, a noxious weed A picture of Hydrilla, a noxious weed A picture of Hydrilla, a noxious weed



JOINTED GOATGRASS
Scientific name:  Aegilops cylindrica

Photos: Kelly Uhing & Steve Dewey, Utah State University
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A picture of Jointed goatgrass, a noxious weed A picture of Jointed goatgrass, a noxious weed A picture of Jointed goatgrass, a noxious weed A picture of Jointed goatgrass, a noxious weed

 


KNOTWEEDS, JAPENESE, GIANT AND BOHEMIAN
Scientific name: Japanese knotweed Polygonum cuspidatum, Giant knotweed Polygonum sachalinense, Bohemian knotweed Polygonum x bohemicum

Photos: www.invasive.org and Patty York (CDA)

Knotweeds fact sheet (PDF)

Japanese knotweed
Polygonum cuspidatum
Giant knotweed
P. sachalinense
Bohemian knotweed
P. x bohemicum
 
A picture of Japenese knotweed, a noxious weed A picture of Giant Knotweed, a noxious weed A picture of Bohemian knotweed, a noxious weed A picture of knotweed, a noxious weed, with man to show scale

 

 



KOCHIA
Scientific name:  Kochia scoparia

Photos: Kelly Uhing
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A picture of Kochia, a noxious weed A picture of Kochia, a noxious weed A picture of Kochia, a noxious weed A picture of Kochia, a noxious weed



LEAFY SPURGE
Scientific name:  Euphorbia esula

Photos: Kelly Uhing

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Leafy spurge fact sheet (PDF)

A picture of Leafy Spurge, a noxious weed A picture of Leafy Spurge, a noxious weed A picture of Leafy Spurge, a noxious weed A picture of Leafy Spurge, a noxious weed



MAYWEED CHAMOMILE
Scientific name:  Anthemis cotula

Photo: Unknown
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Mayweed chamomile fact sheet (PDF)

Photo of a Mayweed Chamomile, a Colorado Noxious Weed Photo of a Mayweed Chamomile, a Colorado Noxious Weed Photo of a Mayweed Chamomile, a Colorado Noxious Weed



MEADOW KNAPWEED
Scientific name:  Centaurea pratensis

Photos: Kelly Uhing
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Meadow knapweed fact sheet (PDF)        

A picture of Meadow Knapweed, a noxious weed A picture of Meadow Knapweed, a noxious weed A picture of Meadow Knapweed, a noxious weed A picture of Meadow Knapweed, a noxious weed



MEDITERRANEAN SAGE
Scientific name:  Salvia aethiopis

Photos: Eric Coombs, Oregon Department of Agriculture, www.forestryimages.com
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Mediterranean sage fact sheet (PDF)         

A picture of Mediterranean Sage, a noxious weed A picture of Mediterranean Sage, a noxious weed A picture of Mediterranean Sage, a noxious weed



MEDUSAHEAD RYE
Scientific name:  Taeniatherum caput-medusae

Photos: Kelly Uhing
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Medusahead rye fact sheet (PDF)

A picture of Medusahead, a noxious weed A picture of Medusahead, a noxious weed A picture of Medusahead, a noxious weed



MOTH MULLEIN
Scientific name:  Verbascum blattaria

Photo: Kelly Uhing
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Moth mullein fact sheet (PDF)

Photo of a Moth Mullein, a Colorado Noxious Weed Photo of a Moth Mullein, a Colorado Noxious Weed Photo of a Moth Mullein, a Colorado Noxious Weed



MUSK THISTLE
Scientific name:  Carduus nutans

Photo: Unknown
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Musk thistle fact sheet (PDF)

Photo of a Musk Thistle, a Colorado Noxious Weed Photo of a Musk Thistle, a Colorado Noxious Weed Photo of a Musk Thistle, a Colorado Noxious Weed Photo of a Musk Thistle, a Colorado Noxious Weed



MYRTLE SPURGE
Scientific name:  Euphorbia myrsinites

Photos: Kelly Uhing
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Myrtle spurge fact sheet (PDF)

A picture of Myrtle Spurge, a noxious weed A picture of Myrtle Spurge, a noxious weed A picture of Myrtle Spurge, a noxious weed



ORANGE HAWKWEED
Scientific name:  Hieracium aurantiacum

Photos: Michael Shephard, USDA Forest Service & Montana Statewide Noxious Weed Awareness & Education Program Archives & Kelly Uhing
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Orange hawkweed fact sheet (PDF)

A picture of Orange Hawkweed, a noxious weed A picture of Orange Hawkweed, a noxious weed A picture of Orange Hawkweed, a noxious weed A picture of Orange Hawkweed, a noxious weed A picture of Orange Hawkweed, a noxious weed



OXEYE DAISY
Scientific name:  Chrysanthemum leucanthemum

Photos: Kelly Uhing
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Oxeye daisy fact sheet (PDF)

A picture of Oxeye Daisy, a noxious weed A picture of Oxeye Daisy, a noxious weed A picture of Oxeye Daisy, a noxious weed A picture of Oxeye Daisy, a noxious weed A picture of Oxeye Daisy, a noxious weed



PERENNIAL PEPPERWEED
Scientific name:  Lepidium latifolium

Photos: Kelly Uhing
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Perennial pepperweed fact sheet (PDF)

Photo of a Perennial Pepperweed, a Colorado Noxious Weed Photo of a Perennial Pepperweed, a Colorado Noxious Weed Photo of a Perennial Pepperweed, a Colorado Noxious Weed



PLUMLESS THISTLE
Scientific name:  Carduus acanthoides

Photos: Kelly Uhing & Gary L. Piper, Washington State University; www.forestryimages.com
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Plumless thistle fact sheet (PDF)

Photo of a Plumeless Thistle, a Colorado Noxious Weed Photo of a Plumeless Thistle, a Colorado Noxious Weed Photo of a Plumeless Thistle, a Colorado Noxious Weed Photo of a Plumeless Thistle, a Colorado Noxious Weed



POISON HEMLOCK
Scientific name:  Conium maculatum

Photos: Kelly Uhing
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Photo of a Poison Hemlock, a Colorado Noxious Weed Photo of a Poison Hemlock, a Colorado Noxious Weed Photo of a Poison Hemlock, a Colorado Noxious Weed Photo of a Poison Hemlock, a Colorado Noxious Weed



PUNCTUREVINE
Scientific name:  Tribulus terrestris

Photos: Kelly Uhing, close up (with blue background) by Steve Dewey.
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Photo of a Puncturevine, a Colorado Noxious Weed Photo of a Puncturevine, a Colorado Noxious Weed Photo of a Puncturevine, a Colorado Noxious Weed Photo of a Puncturevine, a Colorado Noxious Weed Photo of a Puncturevine, a Colorado Noxious Weed



PURPLE LOOSESTRIFE
Scientific name:  Lythrum salicaria

Photos: Kelly Uhing
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Purple loosestrife fact sheet (PDF)

Photo of a Purple Loosestrife, a Colorado Noxious Weed Photo of a Purple Loosestrife, a Colorado Noxious Weed Photo of a Purple Loosestrife, a Colorado Noxious Weed Photo of a Purple Loosestrife, a Colorado Noxious Weed



QUACKGRASS
Scientific name:  Elytrigia repens

Photo: Unknown
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Quackgrass fact sheet (PDF)

Photo of a Quackgrass, a Colorado Noxious Weed Photo of a Quackgrass, a Colorado Noxious Weed Photo of a Quackgrass, a Colorado Noxious Weed Photo of a Quackgrass, a Colorado Noxious Weed



REDSTEM FILAREE
Scientific name:  Erodium cicutarium

Photo: Unknown
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Redstem filaree fact sheet (PDF)

Photo of a Redstem Filaree, a Colorado Noxious Weed Photo of a Redstem Filaree, a Colorado Noxious Weed Photo of a Redstem Filaree, a Colorado Noxious Weed



RUSH SKELETONWEED
Scientific name:  Chondrilla juncea

Photo: Unknown and Utah State University Archives
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Rush skeletonweed fact sheet (PDF)

Photo of a Rush Skeletonweed, a Colorado Noxious Weed Photo of a Rush Skeletonweed, a Colorado Noxious Weed Photo of a Rush Skeletonweed, a Colorado Noxious Weed Photo of a Rush Skeletonweed, a Colorado Noxious Weed



RUSSIAN KNAPWEED
Scientific name:  Acroptilon repens

Photos: Steve Dewey, Utah State University, www.forestryimages.com & Adams County Weed Program (Colorado)
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Russian knapweed fact sheet (PDF)

Photo of a Russian Knapweed, a Colorado Noxious Weed Photo of a Russian Knapweed, a Colorado Noxious Weed Photo of a Russian Knapweed, a Colorado Noxious Weed Photo of a Russian Knapweed, a Colorado Noxious Weed



RUSSIAN-OLIVE
Scientific name:  Elaeagnus angustifolia

Photos: Kelly Uhing; James Miller, USDA Forest Service
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Russian olive fact sheet (PDF)

Photo of a Russian Olive, a Colorado Noxious Weed Photo of a Russian Olive, a Colorado Noxious Weed Photo of a Russian Olive, a Colorado Noxious Weed



SALT CEDAR (TAMARIX)
Scientific name:  Tamarix ramosissima

Photos: Kelly Uhing
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Salt cedar fact sheet (PDF)

Photo of a Salt cedar (Tamarisk), a Colorado Noxious Weed Photo of a Salt cedar (Tamarisk), a Colorado Noxious Weed Photo of a Salt cedar (Tamarisk), a Colorado Noxious Weed Photo of a Salt cedar (Tamarisk), a Colorado Noxious Weed



SCENTLESS CHAMOMILE
Scientific name:  Matricaria perforata

Photo: Kelly Uhing
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Scentless chamomile fact sheet (PDF)

Photo of a Scentless Chamomile, a Colorado Noxious Weed Photo of a Scentless Chamomile, a Colorado Noxious Weed



SCOTCH THISTLE
Scientific name:  Onopordum acanthium

Photos: Kelly Uhing
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Scotch thistle fact sheet (PDF)

Photo of a Scotch Thistle, a Colorado Noxious Weed Photo of a Scotch Thistle, a Colorado Noxious Weed Photo of a Scotch Thistle, a Colorado Noxious Weed Photo of a Scotch Thistle, a Colorado Noxious Weed



SERICEA LESPEDEZA
Scientific name:  Lespedeza cuneata

Photos: Kelly Uhing
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Sericea lespedeza fact sheet (PDF)

Photo of a Sericea Lespedeza, a Colorado Noxious Weed Photo of a Sericea Lespedeza, a Colorado Noxious Weed Photo of a Sericea Lespedeza, a Colorado Noxious Weed Photo of a Sericea Lespedeza, a Colorado Noxious Weed



SPOTTED KNAPWEED
Scientific name:  Centaurea maculosa

Photos: Kelly Uhing
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Spotted knapweed fact sheet (PDF)

Photo of a Spotted Knapweed, a Colorado Noxious Weed Photo of a Spotted Knapweed, a Colorado Noxious Weed Photo of a Spotted Knapweed, a Colorado Noxious Weed Photo of a Spotted Knapweed, a Colorado Noxious Weed



SPURRED ANODA
Scientific name:  Anoda cristata

Photo: Unknown
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Spurred anoda fact sheet (PDF)

Photo of a Spurred Anoda, a Colorado Noxious Weed Photo of a Spurred Anoda, a Colorado Noxious Weed Photo of a Spurred Anoda, a Colorado Noxious Weed Photo of a Spurred Anoda, a Colorado Noxious Weed Photo of a Spurred Anoda, a Colorado Noxious Weed Photo of a Spurred Anoda, a Colorado Noxious Weed



SQUARROSE KNAPWEED
Scientific name:  Centaurea virgata

Photos: Steve Dewey, Utah State University
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Squarrose knapweed fact sheet (PDF)

Photo of a Squarrose Knapweed, a Colorado Noxious Weed Photo of a Squarrose Knapweed, a Colorado Noxious Weed Photo of a Squarrose Knapweed, a Colorado Noxious Weed Photo of a Squarrose Knapweed, a Colorado Noxious Weed



SULFUR CINQUEFOIL
Scientific name:  Potentilla recta

Photos: Kelly Uhing
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Sulfur cinquefoil fact sheet (PDF)

Photo of a Sulfur Cinquefoil, a Colorado Noxious Weed Photo of a Sulfur Cinquefoil, a Colorado Noxious Weed Photo of a Sulfur Cinquefoil, a Colorado Noxious Weed



TANSY RAGWORT
Scientific name:  Senecio jacobaea

Photos: Kelly Uhing & Utah State University Archives; www.forestryimages.com
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Tansy ragwort fact sheet (PDF)

Photo of a Tansy Ragwort, a Colorado Noxious Weed Photo of a Tansy Ragwort, a Colorado Noxious Weed Photo of a Tansy Ragwort, a Colorado Noxious Weed Photo of a Tansy Ragwort, a Colorado Noxious Weed Photo of a Tansy Ragwort, a Colorado Noxious Weed



VENICE MALLOW
Scientific name:  Hibiscus trionum

Photo: "Weeds of California and other Western states"
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Venice mallow fact sheet (PDF)

Photo of a Venice Mallow, a Colorado Noxious Weed Photo of a Venice Mallow, a Colorado Noxious Weed Photo of a Venice Mallow, a Colorado Noxious Weed Photo of a Venice Mallow, a Colorado Noxious Weed



WILD CARAWAY
Scientific name:  Carum carvi

Photo: Unknown
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Wild caraway fact sheet (PDF)

Photo of a Wild caraway, a Colorado Noxious Weed Photo of a Wild caraway, a Colorado Noxious Weed Photo of a Wild caraway, a Colorado Noxious Weed



YELLOW NUTSEDGE
Scientific name:  Cyperus esculentus

Photo: Unknown
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Yellow nutsedge fact sheet (PDF)

Photo of a Yellow Nutsedge, a Colorado Noxious Weed Photo of a Yellow Nutsedge, a Colorado Noxious Weed Photo of a Yellow Nutsedge, a Colorado Noxious Weed



YELLOW STARTHISTLE
Scientific name:  Centaurea solstitialis

Photos: Kelly Uhing & Steve Dewey, Utah State University; www.forestryimages.com
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Yellow starthistle fact sheet (PDF)

Photo of a Yellow Starthistle, a Colorado Noxious Weed Photo of a Yellow Starthistle, a Colorado Noxious Weed Photo of a Yellow Starthistle, a Colorado Noxious Weed Photo of a Yellow Starthistle, a Colorado Noxious Weed Photo of a Yellow Starthistle, a Colorado Noxious Weed Photo of a Yellow Starthistle, a Colorado Noxious Weed



YELLOW TOADFLAX
Scientific name:  Linaria vulgaris

Photos: Colorado State University Cooperative Extension Services & Irene Shonle, CSU extension.
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Yellow toadflax fact sheet (PDF)

Photo of a Yellow Toadflax, a Colorado Noxious Weed Photo of a Yellow Toadflax, a Colorado Noxious Weed Photo of a Yellow Toadflax, a Colorado Noxious Weed Photo of a Yellow Toadflax, a Colorado Noxious Weed