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Troublesome Weeds of the West

For in depth descriptions about each weed, visit one of these two pages: A-L | M-Z

Absinth wormwood

Absinth wormwood
(Artemisia absinthium)

African rue

African rue
(Peganum harmala)

Bermudagrass

Bermudagrass
(Cynodon dactylon)

Black henbane

Black henbane
(Hyoscyamus niger)

Blueweed

Blueweed
(Echium vulgare)

Brazilian egeria

Brazilian egeria
(Egeria densa)

Buffalobur

Buffalobur
(Solanum rostratum)

Buffelgrass

Buffelgrass
(Pennisetum ciliare)

Camelthorn

Camelthorn
(Alhagi maurorum)

Canada thistle

Canada thistle
(Cirsium arvense)

Cheatgrass

Cheatgrass
(Bromus tectorum)

Common burdock

Common burdock
(Arctium minus)

Common crupina

Common crupina
(Crupina vulgaris)

Common tansy

Common tansy
(Tanacetum vulgare)

Dalmatian toadflax

Dalmatian toadflax
(Linaria dalmatica)

Diffuse knapweed

Diffuse knapweed
(Centaurea diffusa)

Dyer’s woad

Dyer's woad
(Isatis tinctoria)

Eurasian watermilfoil

Eurasian watermilfoil
(Myriophyllum spicatum)

Field bindweed

Field bindweed
(Convolvulus arvensis)

Flowering rush

Flowering rush
(Butomus umbellatus)

Garlic mustard

Garlic mustard
(Alliaria petiolata)

Giant reed

Giant reed
(Arundo donax)

Giant salvinia

Giant salvinia
(Salvinia molesta)

Himalayan blackberry

Himalayan blackberry
(Rubus armeniacus)

Hoary alyssum

Hoary alyssum
(Berteroa incana)

Horsenettle

Horsenettle
(Solanum carolinense)

Houndstongue

Houndstongue
(Cynoglossum officinale)

Hydrilla

Hydrilla
(Hydrilla verticillata)

Japanese knotweed (Polygonum cuspidatum)

Japanese knotweed
(Polygonum cuspidatum)

Johnsongrass

Johnsongrass
(Sorghum halepense)

Jointed goatgrass

Jointed goatgrass
(Aegilops cylindrica)

Knotweed complex

Knotweed complex
(Polygonum spp.)

Leafy spurge

Leafy spurge
(Euphorbia esula)

Lehman lovegrass

Lehman lovegrass
(Eragrostis lehmanniana)

Malta starthistle

Malta starthistle
(Centaurea melitensis)

Meadow hawkweed

Meadow hawkweed
(Hieracium caespitosum)

Meadow knapweed

Meadow knapweed
(Centaurea pratensis)

Mediterranean sage

Mediterranean sage
(Salvia aethiopis)

Medusahead

Medusahead
(Taeniatherum caput-medusae)

Musk thistle

Musk thistle
(Carduus nutans)

Orange hawkweed

Orange hawkweed
(Hieracium aurantiacum)

Oxeye daisy

Oxeye daisy
(Chrysanthemum leucanthemum)

Perennial pepperweed

Perennial pepperweed
(Lepidium latifolium)

Perennial sowthistle

Perennial sowthistle
(Sonchus arvensis)

Phragmites

Phragmites
(Phragmites australis)

Plumeless thistle

Plumeless thistle
(Carduus acanthoides)

Poison hemlock

Poison hemlock
(Conium maculatum)

Puncturevine

Puncturevine
(Tribulus terrestris)

Purple loosestrife

Purple loosestrife
(Lythrum salicaria)

Quackgrass

Quackgrass
(Agropyron repens)

Rush skeletonweed

Rush skeletonweed
(Chondrilla juncea)

Russian knapweed

Russian knapweed
(Acroptilon repens)

Russian olive

Russian olive
(Elaeagnus angustifolia)

Saharan mustard

Saharan mustard
(Brassica tournefortii)

Saltcedar complex

Saltcedar complex
(Tamarix spp.)

Scentless chamomile

Scentless chamomile
(Tripleurospermum perforatum)

Scotch broom

Scotch broom
(Cytisus scoparius)

Scotch thistle

Scotch thistle
(Onopordum acanthium)

Sericea lespedeza

Sericea lespedeza
(Lespedeza cuneata)

Silverleaf nightshade

Silverleaf nightshade
(Solanum elaeagnifolium)

Skeletonleaf bursage

Skeletonleaf bursage
(Ambrosia tomentosa)

Smooth cordgrass

Smooth cordgrass
(Spartina alterniflora)

Spotted knapweed

Spotted knapweed
(Centaurea maculosa)

Squarrose knapweed

Squarrose knapweed
(Centaurea virgata)

St. Johnswort

St. Johnswort
(Hypericum perforatum)

Sulfur cinquefoil

Sulfur cinquefoil
(Potentilla recta)

Syrian beancaper

Syrian beancaper
(Zygophyllum fabago)

Tansy ragwort

Tansy ragwort
(Senecio jacobaea)

Toothed spurge

Toothed spurge
(Euphorbia dentata)

Water hyacinth

Water hyacinth
(Eichhornia crassipes)

Whitetop

Whitetop
(Cardaria draba)

Wild proso millet

Wild proso millet
(Panicum miliaceum)

Yellowflag iris

Yellowflag iris
(Iris pseudacorus)

Yellow starthistle

Yellow starthistle
(Centaurea solstitialis)

Yellow toadflax

Yellow toadflax
(Linaria vulgaris)

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Department of Land Resources of Environmental Sciences, Montana State University, Bozeman, Montana