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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
Family Composites, Sunflower
Flower Color Pink, rose
Plant Type Shrub
Introduced Yes
Location Owyhee Junction, OR, Willow Creek
Native No
Weed Yes
jointed goatgrass (Aegilops cylindrica)
Aegilops cylindrica
Common Names jointed goatgrass
Family Grass
Flower Color Green-yellow
Plant Type Grass
Elevation 3200'
Location Jenkins Rd. north of Weiser ID
Native No
Weed Yes
mountain alder (Alnus incana)
Alnus incana
Common Names mountain alder
Family Birch
Plant Type Tree
Short Description A small stream-side tree. Flowers and catkins develop and flower on twigs of the previous year before the leaves come out.
Location McCall, ID
Native Yes
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
rigid fiddleneck (Amsinckia retrorsa)Amsinckia retrorsa
Common Names rigid fiddleneck
Family Borage
Flower Color Goldenrod
Location Lower Owyhee River, OR
Native No
Weed Yes
threadstalk milkvetch, basalt milkvetch (Astragalus filipes)
Astragalus filipes
Common Names threadstalk milkvetch, basalt milkvetch
Family Legume or Pea
Flower Color Yellow
Plant Type Forb
Native Yes
Weed Yes
devil's beggarticks, leafy beggarticks, or leafy sticktight (Bidens frondosa)Bidens frondosa
Common Names devil's beggarticks, leafy beggarticks, leafy sticktight
Family Composites, Sunflower
Plant Type Shrub
Location Ontario, OR
Native No
Weed Yes
black mustard (Brassica nigra)Brassica nigra
Common Names black mustard
Family Mustard
Flower Color Yellow
Plant Type Forb
Introduced Yes
Weed Yes
Cheat grass (Bromus tectorum)Bromus tectorum
Common Names cheat grass, downy brome
Family Grass
Flower Color Green
Plant Type Grass
Introduced Yes
Weed Yes
butterfly bush (Buddleja sp.)
Buddleja sp.
Common Names butterfly bush
Family Butterfly bush
Plant Type Shrub
Native No
Weed Yes
shepherds 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, ID, Nyssa, OR, Ontario, OR
Native No
Weed Yes
musk thistle (Carduus nutans)Carduus nutans
Common Names musk thistle
Family Sunflower
Flower Color Purple
Plant Type Forb
Introduced Yes
Weed Yes
spotted knapweed (Centaurea maculosa)Centaurea maculosa
Common Names spotted knapweed
Family 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
prostate spurge, milk spurge (Chamaesyce maculata)
Chamaesyce maculata
Common Names prostate 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
Location Council, ID, Cow Hollow, OR, Indian Valley, ID
Native No
Weed Yes
green rabbitbrush (Chrysothamnus viscidiflorus)Chrysothamnus viscidiflorus
Common Names green rabbitbrush
Family Composites, Sunflower
Flower Color Yellowish
Plant Type Shrub
Native Yes
Weed Yes
Poison Hemlock (Conium maculatum)Conium maculatum
Common Names poison hemlock
Family Parsley
Flower Color White
Plant Type Herb
Weed Yes
Field bindweed (Convolvulus arvensis)Convolvulus arvensis
Common Names Field bindweed
Family Morningglory
Flower Color White/Purple
Plant Type Herb
Introduced Europe
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
Hairy crabgrass (Digitaria sanguinalis)Digitaria sanguinalis
Common Names hairy crabgrass
Family Grass
Plant Type Grass
Introduced Yes
Weed Yes
Barnyard grass (Echinochloa muricata) Echinochloa muricata
Common Names barnyard grass
Family Grass
Flower Color Green
Plant Type Grass
Introduced Yes
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
leafy spurge (Euphorbia esula)Euphorbia esula
Common Names leafy spurge
Family Spurge
Flower Color Yellow
Plant Type Forb
Introduced Yes
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, ID
Weed Yes
sweet cicely (Osmorhiza chilenis)Galium triflorum
Common Names sweetscented bedstraw, fragrant bedstraw
Family Madder
Flower Color White
Plant Type Herb
Location Mann Creek Res. ID
Native ?
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
Weed Yes
jagged chickweed (Holosteum umbellatum)Holosteum umbellatum
Common Names jagged chickweed
Family Pink
Flower Color White
Location Ontario, OR
Native No
Weed Yes
wild barley, mouse barley, hare barley (Hordeum leporinum)
Hordeum leporinum
Common Names wild barley, mouse barley, hare barley
Family Grass
Plant Type Grass
Introduced Yes
Location Lower Owyhee River, OR
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 Sunflower
Plant Type Forb
Native No
Weed Yes
Western Juniper (Juniperus occidentalis)Juniperus occidentalis
Common Names western juniper
Family Cypress
Flower Color -none-
Plant Type Tree
Location McCall, ID
Native Yes
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
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, ID
Native No
Weed Noxious, Yes
common mallow, cheeseweed (Malva neglecta)
Malva neglecta
Common Names common mallow, cheeseweed
Family Mallow
Flower Color Purple, white
Plant Type Herb
Weed Yes
Hoarhound (Marrubium vulgare)
Marrubium vulgare
Common Names hoarhound
Family Mint
Flower Color White-pale pink
Plant Type Herb
Location McCall, ID
Weed Yes
pineappleweed (Matricaria matriarioides)Matricaria matriarioides
Common Names pineappleweed
Family Sunflower
Plant Type Forb
Native North America
Weed Yes
yellow sweetclover (Melilotus officinalis )
Melilotus officinalis
Common Names yellow sweetclover
Family Legume or Pea
Flower Color Yellow
Plant Type Herb
Introduced Yes
Weed Yes
Pellitory (Parietaria pensylvanica)
Parietaria pensylvanica
Common Names pellitory
Family Nettle
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
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
Weed Yes
Japanese knotweed (Polygonum cuspidatum)
Polygonum cuspidatum
Common Names Japanese knotweed
Family Buckwheat
Plant Type Forb
Weed Yes
common purslane (Portulaca oleracea)
Portulaca oleracea
Common Names common purslane
Family Purslane
Flower Color Yellow
Plant Type Herb
Short Description Common purslane
Weed Yes
wild plum (Prunus sp.)Prunus sp.
Common Names wild plum
Family Rose
Plant Type Tree
Weed Yes
blister buttercup, cursed buttercup, cursed crowfoot, celeryleafed buttercup, celeryleafed buttercup (Ranunculus sceleratus)Ranunculus sceleratus
Common Names blister buttercup, cursed buttercup, cursed crowfoot, celeryleafed buttercup
Family Buttercup
Flower Color Yellow
Location Mann Creek, ID
Native No
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
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.
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
Weed Yes
common groundsel, old-man-in-the-Spring (Senecio vulgaris)Senecio vulgaris
Common Names common groundsel, old-man-in-the-Spring
Family Composites, Sunflower
Flower Color White, yellow
Plant Type Forb
Location Ontario, OR
Native No
Weed Yes
tumble mustard(Sisymbrium altissimum)Sisymbrium altissimum
Common Names tumble mustard
Family Mustard
Flower Color Yellowish
Plant Type Forb
Introduced Yes
Weed Yes
annual sowthistle (Sonchus oleraceus)Sonchus oleraceus
Common Names annual sowthistle
Family Composites, Sunflower
Flower Color Yellow
Plant Type Forb
Weed Yes
Medusahead rye (Taeniatherum caput-medusae)Taeniatherum caput-medusae
Common Names medusahead rye
Family Grass
Flower Color Green-yellow
Plant Type Grass
Introduced Yes
Location Jordan Valley. ID
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, ID
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
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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