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Malheur Experiment Station
Oregon State University

Plants by Scientific Name where Weed includes Yes


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Russian knapweed (Acroptilon repens)
 Acroptilon repens
Common Names Russian knapweed, hardheads
Family Composites, Sunflower
Flower Color Pink, rose
Plant Type Shrub
Introduced Yes
Native No
Weed Noxious, Yes
creeping bentgrass(Agrostis stolonifera)Agrostis stolonifera
Common Names creeping bentgrass
Family Grass
Plant Type Grass
Short Description An introduced weed, sometimes used for lawns.
Introduced Yes
Weed Yes
meadow foxtail (Alopecurus pratensis)Alopecurus pratensis
Common Names meadow foxtail
Family Grass
Weed Yes
prostrate pigweed (Amaranthus blitoides)Amaranthus blitoides
Common Names prostrate pigweed
Family Amaranth
Plant Type Herb
Weed Yes
Redroot Pigweed (Amaranthus retroflexus)Amaranthus retroflexus
Common Names redroot pigweed
Family Amaranth
Flower Color Green
Plant Type Forb
Weed Yes
indigo bush, false indigo (Amorpha fruticosa)
Amorpha fruticosa
Common Names indigo bush, false indigo
Family Legume or Pea
Flower Color Purple
Plant Type Shrub - Tree
Native Yes
Weed Yes
Bidens frondosa
Common Names Leafy Beggarticks, Devil's Beggarticks, Leafy Sticktight
Family Composites, Sunflower
Native No
Weed Yes
black mustard (Brassica nigra)Brassica nigra
Common Names black mustard
Family Mustard
Flower Color Yellow
Plant Type Forb
Introduced Yes
Native No
Weed Yes
Cheat grass (Bromus tectorum)Bromus tectorum
Common Names cheat grass, downy brome
Family Grass
Flower Color Green
Plant Type Grass
Introduced Yes
Native No
Weed Yes
butterfly bush (Buddleja sp.)
Buddleja sp.
Common Names butterfly bush
Family Butterfly bush
Plant Type Shrub
Native No
Weed Yes
shepherd's purse (Capsella bursa-pastoris)Capsella bursa-pastoris
Common Names shepherd's purse
Family Mustard
Flower Color White
Plant Type Herb
Short Description Flat, triangular pods are all along a fine stalk. Leaves are pinnatifid. The plant forms a rosette.
Location McCall
Native No
Weed Yes
musk thistle (Carduus nutans)Carduus nutans
Common Names musk thistle
Family Composites, Sunflower
Flower Color Purple
Plant Type Forb
Introduced Yes
Weed Yes
diffuse knapweed (Centaurea diffusa)
Centaurea diffusa
Common Names diffuse knapweed
Family Composites, Sunflower
Flower Color Light Pink
Plant Type Forb
Native No
Weed Yes
spotted knapweed (Centaurea maculosa)Centaurea maculosa
Common Names spotted knapweed
Family Composites, Sunflower
Plant Type Forb
Native No
Weed Yes
yellow starthistle (Centaurea solstitialis)Centaurea solstitialis
Common Names yellow starthistle
Family Composites, Sunflower
Flower Color Yellow
Plant Type Forb
Native No
Weed Yes
prostrate spurge, milk spurge (Chamaesyce maculata)
Chamaesyce maculata
Common Names prostrate spurge, milk spurge
Family Spurge
Plant Type Forb
Native Yes
Weed Yes
rush skeletonweed (Chondrilla juncea)
Chondrilla juncea
Common Names rush skeletonweed
Family Composites, Sunflower
Flower Color Yellow
Plant Type Forb
Introduced Yes
Native No
Weed Yes
green rabbitbrush (Chrysothamnus viscidiflorus)Chrysothamnus viscidiflorus
Common Names green rabbitbrush, Yellow rabbitbrush
Family Composites, Sunflower
Flower Color Yellowish
Plant Type Shrub
Short Description Yellow rabbitbrush is common in the intermountain west. It is an early succession plant following fire.
Native Yes
Weed Yes
chicory (Cichorium intybus)
Cichorium intybus
Common Names chicory
Family Composites, Sunflower
Flower Color Blue
Plant Type Herb
Location McCall
Native No
Weed Yes
Field bindweed (Convolvulus arvensis)Convolvulus arvensis
Common Names Field bindweed
Family Morningglory
Flower Color White/Purple
Plant Type Herb
Introduced Europe
Native No
Weed Yes
dodder (cuscuta sp.)Cuscuta sp.
Common Names dodder
Family Morningglory
Flower Color White, cream
Plant Type Vine
Weed Yes
sacred datura, angel's trumpet (Datura innoxia)
Datura innoxia
Common Names sacred datura, angel's trumpet
Family Potato
Flower Color White
Plant Type Forb
Native Yes
Weed Yes
Jimsonweed (Datura stramonium)
Datura stramonium
Common Names Jimsonweed
Family Potato
Flower Color White/Purple
Plant Type Shrub
Introduced Yes
Native No
Weed Yes
Queen Anne's lace, Wild Carrot (Daucus carota)Daucus carota
Common Names Queen Anne's lace, wild carrot
Family Parsley
Flower Color White
Plant Type Herb
Weed Yes
Hairy crabgrass (Digitaria sanguinalis)Digitaria sanguinalis
Common Names hairy crabgrass
Family Grass
Plant Type Grass
Introduced Yes
Native No
Weed Yes
common teasel (Dipsacus fullonum)
Dipsacus fullonum
Common Names common teasel
Family Teasel
Flower Color Brown - purple
Plant Type Shrub
Introduced Europe
Weed Yes
Barnyard grass (Echinochloa muricata) Echinochloa muricata
Common Names barnyard grass
Family Grass
Flower Color Green
Plant Type Grass
Introduced Yes
Native No
Weed Yes
Russian Olive (Elaeagnus angustifolia)
Elaeagnus angustifolia
Common Names Russian Olive
Family Oleaster
Plant Type Tree
Native No
Weed Yes
panicle willowweed (Epilobium brachycarpum)
Epilobium brachycarpum
Common Names panicle willowweed
Family Evening Primrose
Flower Color Purple, white
Plant Type Forb
Weed Yes
Scouringrush (Equisetum hyemale)Equisetum hyemale
Common Names scouringrush
Family Horsetail
Flower Color Brown
Plant Type Forb
Native Yes
Weed Yes
smooth scouring-rush, smooth horsetail (Equisetum laevigatum)Equisetum laevigatum
Common Names smooth scouring-rush
Family Horsetail
Weed Yes
leafy spurge (Euphorbia esula)Euphorbia esula
Common Names leafy spurge
Family Spurge
Flower Color Yellow
Plant Type Forb
Introduced Yes
Weed Yes
thyme-leaved spurge(Euphorbia glyptosperma)Euphorbia glyptosperma
Common Names thyme-leaved spurge
Family Spurge
Weed Yes
petty spurge (Euphorbia peplus)
Euphorbia peplus
Common Names petty spurge
Family Spurge
Plant Type Forb
Introduced Yes
Weed Yes
Galium aparine
Common Names cleavers
Family Madder
Plant Type Herb
Location McCall
Weed Yes
sweet woodruf, bedstraw (Galium boreale)
Galium boreale
Common Names sweet woodruf, bedstraw
Family Madder
Flower Color White
Plant Type Herb
Location McCall and many locations
Weed Yes
Sweetscented Bedstraw (Galium triflorum)Galium triflorum
Common Names fragrant bedstraw, sweetscented bedstraw
Family Madder
Weed Yes
small-flowered gaura (Gaura mollis)Gaura mollis
Common Names small-flowered gaura
Family Evening Primrose
Flower Color Pink, Green
Plant Type Forb
Native Yes
Weed Yes
wild licorice (Glycyrrhiza lepidota)Glycyrrhiza lepidota
Common Names wild licorice
Family Legume or Pea
Plant Type Forb
Native Yes
Weed Yes
Halogeton (Halogeton glomeratus)Halogeton glomeratus
Common Names halogeton
Family Goosefoot
Flower Color Green-white
Plant Type Forb
Introduced Yes
Native No
Weed Yes
Jagged Chickweed (Holosteum umbellatum)Holosteum umbellatum
Common Names jagged chickweed
Family Pink
Flower Color White
Plant Type Herb
Native No
Weed Yes
wild barley, mouse barley (Hordeum leporinum)Hordeum leporinum
Common Names mouse barley, hare barley, wild barley
Family Grass
Plant Type Grass
Introduced Yes
Native No
Weed Yes
St. John's Wort (Hypericum formosum var. Scouleri)Hypericum formosum var. Scouleri
Common Names St. John's Wort
Family St. John's Wort
Flower Color Yellow
Plant Type Herb
Weed Yes
marshelder (Iva xanthifolia)Iva xanthifolia
Common Names marshelder
Family Composites, Sunflower
Plant Type Forb
Native No
Weed Yes
prickly lettuce, compass plant (Lactuca serriola )
Lactuca serriola
Common Names prickly lettuce, compass plant
Family Composites, Sunflower
Flower Color Yellow
Plant Type Herb
Introduced Yes
Native No
Weed Yes
henbit, henbit deadnettle (Lamium amplexicaule)Lamium amplexicaule
Common Names henbit , henbit deadnettle
Family Mint
Flower Color Purple
Plant Type Forb
Introduced Yes
Weed Yes
Clasping Pepperweed (Lepidium perfoliatum)Lepidium perfoliatum
Common Names clasping pepperweed
Family Mustard
Flower Color Green-yellow
Plant Type Forb
Native No
Weed Yes
butter and eggs, bread and butter (Linaria vulgaris)
Linaria vulgaris
Common Names butter and eggs, bread and butter
Family Figwort or Snapdragon
Flower Color Yellow
Plant Type Herb
Location McCall
Native No
Weed Noxious, Yes
Lygodesmia juncea
Common Names rush skeletonplant
Family Composites, Sunflower
Flower Color light purple
Plant Type Forb
Native Yes
Weed Yes
common mallow, cheeseweed (Malva neglecta)
Malva neglecta
Common Names common mallow, cheeseweed
Family Mallow
Flower Color Purple, white
Plant Type Herb
Native No
Weed Yes
HorehoundMarrubium vulgare
Common Names white horehound, horehound
Family Mint
Flower Color White-pale pink
Plant Type Herb
Short Description Horehound
Location McCall and many locations
Native No
Weed Yes
pineappleweed (Matricaria matricarioides)Matricaria matricarioides
Common Names pineappleweed
Family Composites, Sunflower
Plant Type Forb
Native North America
Weed Yes
black medic (Medicago lupulina)Medicago lupulina
Common Names black medic
Native No
Weed Yes
white sweetclover (Melilotus alba)
Melilotus alba
Common Names white sweetclover
Family Legume or Pea
Flower Color White
Plant Type Forb
Introduced Yes
Native No
Weed Yes
yellow sweetclover (Melilotus officinalis )
Melilotus officinalis
Common Names yellow sweetclover
Family Legume or Pea
Flower Color Yellow
Plant Type Herb
Introduced Yes
Native No
Weed Yes
Pellitory (Parietaria pensylvanica)
Parietaria pensylvanica
Common Names pellitory
Family Nettle
Plant Type Forb
Native Yes
Weed Yes
reed canarygrass (Phalaris arundinacea)Phalaris arundinacea
Common Names reed canarygrass
Plant Type Grass
Weed Yes
annual bluegrass (Poa annua)Poa annua
Common Names annual bluegrass
Family Grass
Flower Color Green
Plant Type Grass
Native No
Weed Yes
Smartweed (Polygonum)Polygonum
Common Names smart weed, smartweed
Family Buckwheat
Flower Color Pink and Yellowish
Plant Type Forb
Native Yes
Weed Yes
erect knotweed (Polygonum argyrocoleon)
Polygonum argyrocoleon
Common Names erect knotweed
Family Buckwheat
Flower Color Green
Plant Type Forb
Weed Yes
Water smartweed (Polygonum coccineum)Polygonum coccineum
Common Names water smartweed
Family Buckwheat
Flower Color Pink
Plant Type Forb
Native Yes
Weed Yes
knot bindweed, black bindweed, ivy bindweed, climbing bindweed (Polygonum convolvulus)
Polygonum convolvulus
Common Names knot bindweed, black bindweed, ivy bindweed, climbing bindweed
Family Buckwheat
Plant Type Forb
Introduced Yes
Native No
Weed Yes
Japanese knotweed (Polygonum cuspidatum)
Polygonum cuspidatum
Common Names Japanese knotweed
Family Buckwheat
Plant Type Forb
Native No
Weed Yes
Rabbitsfoot (Polypogon Monspeliensis)
Polypogon monspeliensis
Common Names rabbitsfoot
Family Grass
Flower Color Yellowish
Plant Type Grass
Native No
Watershed Malheur
Weed Yes
common purslane (Portulaca oleracea)
Portulaca oleracea
Common Names common purslane
Family Purslane
Flower Color Yellow
Plant Type Herb
Short Description Common purslane
Native No
Weed Yes
wild plum (Prunus sp.)Prunus sp.
Common Names wild plum
Family Rose
Plant Type Tree
Weed Yes
bur buttercup, hornseed buttercup (Ranunculus testiculatus)
Ranunculus testiculatus
Common Names bur buttercup, hornseed buttercup, curveseed butterwort, testiculate buttercup
Family Buttercup
Flower Color Yellowish
Plant Type Herb
Native No
Weed Yes
Russian thistle, tumbleweed (Salsola kali)
Salsola kali
Common Names Russian thistle, tumbleweed
Family Goosefoot
Flower Color Pink, purple
Plant Type Forb
Short Description A Eurasian annual weed of dry, often alkaline areas.
Native No
Weed Yes
bouncingbet, soapwort (Saponaria officinalis)
Saponaria officinalis
Common Names bouncingbet, soapwort
Family Pink
Flower Color White-pale pink
Plant Type Herb
Short Description European origin, escaped as a weed, toxic to livestock but seldom consumed.
Native No
Weed Yes
Common rye (Secale cereale)Secale cereale
Common Names common rye
Family Grass
Plant Type Grass
Introduced Yes
Native No
Weed Yes
common groundsel (Senecio vulgaris)Senecio vulgaris
Common Names common groundsel, old-man-in-the-Spring
Family Composites, Sunflower
Flower Color White, yellow
Plant Type Forb
Native No
Weed Yes
Green foxtail (Setaria viridis)Setaria viridis
Common Names green foxtail
Family Grass
Flower Color Green, mixed
Plant Type Grass
Introduced Yes
Native No
Weed Yes
tall tumblemustard (Sisymbrium altissimum)Sisymbrium altissimum
Common Names tumble mustard, tall tumblemustard
Family Mustard
Flower Color Yellowish
Plant Type Forb
Introduced Yes
Native No
Weed Yes
hairy night shade (Solanum sarrachoides)Solanum sarrachoides
Common Names hairy night shade
Family Potato
Flower Color White
Plant Type Forb
Short Description There berries are Green, brown, and yellow when matured.
Introduced Yes
Native No
Weed Yes
hairy nightshade, hoe nighshade (Solanum sarrachoides)Solanum sarrachoides
Common Names hoe nightshade, hairy nightshade
Family Potato
Weed Yes
annual sowthistle (Sonchus oleraceus)Sonchus oleraceus
Common Names annual sowthistle
Family Composites, Sunflower
Flower Color Yellow
Plant Type Forb
Native No
Weed Yes
salt cedar, tamarisk (Tamarix parviflora)
Tamarix parviflora
Common Names salt cedar, tamarisk
Family Tamarisk
Flower Color White-pale pink/ Purple
Plant Type Tree
Native No
Weed Yes
dandelion (Taraxacum officinale)
Taraxacum officinale
Common Names dandelion
Family Composites, Sunflower
Flower Color Yellow
Plant Type Herb
Location McCall
Native No
Weed Yes
spineless horsebrush (Tetradymia canescens)Tetradymia canescens
Common Names spineless horsebrush
Family Composites, Sunflower
Weed Yes
moth mullein (Verbascum blattaria)Verbascum blattaria
Common Names moth mullein
Family Figwort or Snapdragon
Flower Color White/Purple
Plant Type Herb
Introduced Yes
Native No
Weed Yes
common cockleburr (Xanthium strumarium)
Xanthium strumarium
Common Names common cockleburr
Family Composites, Sunflower
Flower Color Green
Plant Type Forb
Introduced North America
Native No
Weed Yes

For additional information please send an e-mail request to:
Dr. Clinton C. Shock
Clinton.Shock@oregonstate.edu

Malheur Agricultural Experiment Station
595 Onion Avenue
Ontario, OR 97914
(541) 889-2174
FAX (541) 889-7831

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