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Oregon State Noxious Weed List
Clarification of profiles
Oregon Department of Agriculture has compiled profiles of the weeds listed by the Oregon State Weed Board (OSWB).  Profiles include information about the weed, images, and locations in Oregon.
 
These profiles may not reflect the most updated listing by the OSWB, cooperators should always use the Oregon Noxious Weed Policy and Classification for the most up to date and accurate state listed noxious weeds.

A List
"A" Designated weeds as determined by Oregon State Weed Board

Common Name
Scientific Name
Peganum harmala
Alhagi pseudalhagi
Tussilago farfara
Cordgrass
 
 
Common

Spartina anglica
Dense-flowered

Spartina densiflora
Saltmeadow

Spartina patens
Smooth

Spartina alterniflora
European water chestnut
Trapa natans
Flowering rush
Butomus umbellatus
Giant hogweed
Heracleum mantegazzianum
Goatgrass
 
 
Barbed

Aegilops triuncialis
Ovate

Aegilops ovata
Goatsrue Galega officinalis
Hawkweed
 
 
King-devil

Hieracium piloselloides
Mouse-ear

Hieracium pilosella
Orange

Hieracium aurantiacum
Yellow

Hieracium floribundum
Hydrilla
Hydrilla verticillata
Japanese dodder
Cuscuta japonica
Kudzu
Pueraria lobata
Matgrass
Nardus stricta
Oblong spurge
Euphorbia oblongata
Paterson's curse
Echium plantagineum
Purple nutsedge
Cyperus rotundus
Silverleaf nightshade
Solanum elaeagnifolium
Squarrose knapweed
Centaurea virgata
Starthistle
 
 
Iberian

Centaurea iberica
Purple

Centaurea calcitrapa
Syrian bean-caper
Zygophyllum fabago
Thistle
 
 
Plumeless

Carduus acanthoides
Smooth distaff

Carthamus baeticus
Taurian

Onopordum tauricum
Woolly distaff

Carthamus lanatus
White bryonia
Bryonia alba
Yellow floating heart
Nymphoides peltata
Yellow tuft (Alyssum)
 Alyssum murale & Alyssum corsicum

B list
"B" designated weeds as determined by Oregon State Weed Board
(*indicates targeted for biological control)
 
 
Common Name
Scientific Name
Armenian blackberry (Himalayan blackberry) Rubus armeniacus (R. procerus, R. discolor)
Biddy-biddy
Acaena novae-zelandiae
Broom
 
 
French*

Genista monspessulana

Portuguese

Cytisus striatus

Scotch*

Cytisus scoparius

Spanish

Spartium junceum

Buffalobur
Solanum rostratum
Butterfly bush
Buddleja davidii (B.variabilis)
Common bugloss
Anchusa officinalis
Common crupina (bearded creeper) Crupina vulgaris
Common reed Phragmites australis ssp. australis
Creeping yellow cress
Rorippa sylvestris
Cutleaf teasel
Dipsacus laciniatus
Dodder
Cuscuta spp.
Dyers woad
Isatis tinctoria
English ivy
Hedera helix (H. hibernica)
Eurasian watermilfoil
Myriophyllum spicatum
False brome
Brachypodium sylvaticum
Field bindweed*
Convolvulus arvensis
Garlic mustard
Alliaria petiolata
 Geranium  
Herb Robert 
Geranium robertianum
Shiny leaf geranium
 Geranium lucidum
Gorse*
Ulex europaeus
Halogeton
Halogeton glomeratus
Houndstongue
Cynoglossum officinale
​Indigo bush Amorpha fruticosa
Johnsongrass
Sorghum halepense
Jointed goatgrass
Aegilops cylindrical
Jubata grass Cortaderia jubata
Knapweeds
 
 
Diffuse*

Centaurea diffusa

Meadow*

Centaurea pratensis (C. jacea x C. nigra)

Russian*

Acroptilon repens

Spotted*

Centaurea stoebe (C. maculosa)

Knotweeds
 
 
Giant

Fallopia sachalinense (Polyganum)

Himalayan

Fallopia polystachyum (Polyganum)

Japanese

Fallopia japonica (Polyganum cuspidatum)

Kochia
Kochia scoparia
Lesser celandine
Ranunculus ficaria
Meadow hawkweed Hieracium pratense
Mediterranean sage*
Salvia aethiopis
Medusahead rye
Taeniatherum caput-medusae
Old man's beard
Clematis vitalba
Parrot feather
Myriophyllum aquaticum
Perennial peavine
Lathyrus latifolius
Perennial pepperweed
Lepidium latifolium
​Pheasant's eye Adonis aestivali
Poison hemlock
Conium maculatum
Policeman's helmet
Impatiens glandulifera
Puncturevine*
Tribulus terrestris
Purple loosestrife*
Lythrum salicaria
Ragweed
Ambrosia artemisiifolia
​Ribbongrass Phalaris arundinacae
Rush skeletonweed*
Chondrilla juncea
Saltcedar*
Tamarix ramosissima
Small broomrape
Orobanche minor
South American waterweed
Egeria densa (Elodea)
Spanish heath Erica lusitanica
Spikeweed Memizonia pungens
Spiny cocklebur
Xanthium spinosum
Spurge laurel
Daphne laureola
Spurge
 
 
Leafy*

Euphorbia esula

Myrtle

Euphorbia myrsinites

St. Johnswort (Klamath weed) *
Hypericum perforatum
Sulfur cinquefoil
Potentilla recta
Swainsonpea (Austrian peaweed) Sphaerophysa salsula
Tansy ragwort*
Senecio jacobaea
Thistles
 
 
Bull*

Cirsium vulgare

Canada*

Cirsium arvense

Italian*

Carduus pycnocephalus

Milk*

Silybum marianum

Musk*

Carduus nutans

Scotch

Onopordum acanthium

Slender-flowered*

Carduus tenuiflorus

Toadflax
 
 
Dalmatian*

Linaria dalmatica (L. genista)

Yellow*

Linaria vulgaris

​Tree-of heaven Ailanthus altissima
Velvetleaf
Abutilon theophrasti
Water primrose Ludwigia peploides, L. hexapetala, L. grandiflora ssp.
Whitetop
 
 
Hairy

Lepidium pubescens (Cardaria)

Lens-podded

Lepidium chalepensis
(Cardaria)
Hoary cress

Lepidium draba
(Cardaria)
Yellow archangel
Lamiastrum galeobdolon
Yellow flag iris
Iris pseudacorus
Yellow nutsedge
Cyperus esculentus
Yellow starthistle
Centaurea solstitialis