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Malheur Experiment Station
Oregon State University

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velvetleaf (Abutilon theophrasti )Abutilon theophrasti
Common Names velvetleaf
Family Mallow
Flower Color Yellow
Plant Type Shrub
Short Description A large, aggressive annual weed.
Introduced Yes
Native No
Weed Noxious
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
Jointed Goatgrass (Aegilops cylindrica)
Aegilops cylindrica
Common Names jointed goatgrass
Family Grass
Flower Color Green-yellow
Plant Type Grass
Native No
Weed Noxious
forage kochia(Bassia prostrata)Bassia prostrata
Common Names forage kochia
Family Goosefoot
Flower Color Green, Red
Introduced Yes
Native No
Weed No
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
hoary cress, whitetop (Cardaria spp.)
Cardaria spp.
Common Names hoary cress, whitetop
Family Mustard
Flower Color White
Plant Type Herb
Native No
Weed Noxious
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
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
blue mustard, tenella mustard, purple mustard (Chorispora tenella)
Chorispora tenella
Common Names tenella mustard, purple mustard, blue mustard
Family Mustard
Flower Color blue - purple
Plant Type Forb
Introduced Yes
Native No
Weed Noxious
chicory (Cichorium intybus)
Cichorium intybus
Common Names chicory
Family Composites, Sunflower
Flower Color Blue
Plant Type Herb
Location McCall
Native No
Weed Yes
Canada thistle (Cirsium arvense)
Cirsium arvense
Common Names Canada thistle
Family Composites, Sunflower
Flower Color Purple
Plant Type Herb
Short Description Perennial, deep-seated creeping underground roots. Leaves: Spiny, pinnatifid
Location McCall
Native No
Weed Noxious
bull thistle (Cirsium vulgare)
Cirsium vulgare
Common Names bull thistle
Family Composites, Sunflower
Flower Color Purple
Plant Type Herb
Short Description Biennial.
Location McCall
Native No
Weed Noxious
Poison Hemlock (Conium maculatum)Conium maculatum
Common Names poison hemlock
Family Parsley
Flower Color White
Plant Type Herb
Native No
Weed Noxious
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
Yellow Nutsedge (Cyperus esculentus)Cyperus esculentus
Common Names yellow nutsedge
Family Sedge
Flower Color Yellowish
Plant Type Sedge
Native No
Weed Noxious
Jimsonweed (Datura stramonium)
Datura stramonium
Common Names Jimsonweed
Family Potato
Flower Color White/Purple
Plant Type Shrub
Introduced Yes
Native No
Weed Yes
Flixweed (Descurainia sophia)
Descurainia sophia
Common Names flixweed
Family Mustard
Flower Color Yellow
Plant Type Forb
Native No
Weed Noxious
Hairy crabgrass (Digitaria sanguinalis)Digitaria sanguinalis
Common Names hairy crabgrass
Family Grass
Plant Type Grass
Introduced Yes
Native No
Weed Yes
Spring Whitlow-grass (Draba verna)Draba verna
Common Names spring draba, spring whitlow-grass
Family Mustard
Flower Color White, yellow
Native , No
Weed No
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
storksbill, filaree (Erodium cicutarium)
Erodium cicutarium
Common Names storksbill, filaree
Family Geranium
Flower Color Pink, purple
Plant Type Herb
Short Description Leaves: Pinnate-pinnatifid. Native of Europe or Asia.
Location McCall
Native No
Weed No
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
Yellow Flag (Iris pseudacorus)Iris pseudacorus
Common Names yellow flag
Family Iris
Flower Color Yellow
Plant Type Forb
Short Description Introduced plant, conspicuous along edges of ponds, irrigation canals.
Native No
Weed Can be
marshelder (Iva xanthifolia)Iva xanthifolia
Common Names marshelder
Family Composites, Sunflower
Plant Type Forb
Native No
Weed Yes
Kochia (Kochia scoparia)


Kochia scoparia
Common Names kochia
Family Goosefoot
Plant Type Forb
Native No
Weed Noxious
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
perennial pepperweed (Lepidium latifolium L) 
Lepidium latifolium L
Common Names perennial pepperweed
Family Mustard
Flower Color White, cream
Plant Type Forb
Introduced Yes
Native No
Weed Noxious
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
Birds Foot Trefoil (Lotus Corniculatus)Lotus corniculatus
Common Names bird's-foot trefoil
Family Legume or Pea
Flower Color Yellow
Plant Type Herb
Native No
Weed Can be
Purple Loosestrife (Lythrum salicaria)Lythrum salicaria
Common Names purple loosestrife
Family Loosestrife
Flower Color Purple
Plant Type Herb
Native No
Weed Noxious
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
black medic (Medicago lupulina)Medicago lupulina
Common Names black medic
Native No
Weed Yes
alfalfa (Medicago sativa)Medicago sativa
Common Names alfalfa
Native No
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
Scotch thistle (Onopordum acanthuim) Onopordum acanthium
Common Names Scotch thistle
Family Composites, Sunflower
Flower Color Purple
Plant Type Forb
Native No
Weed Noxious
Palmer's penstemon(Penstemon palmeri)Penstemon palmeri
Common Names Palmer's penstemon
Family Figwort or Snapdragon
Flower Color White-pale pink
Plant Type Herb
Native No
Weed No
Wild Crab Apple (Peraphyllum ramosissimum)Peraphyllum ramosissimum
Common Names wild crabapple, squaw apple, wild crab apple
Family Rose
Native No, Yes
Weed Can be
annual bluegrass (Poa annua)Poa annua
Common Names annual bluegrass
Family Grass
Flower Color Green
Plant Type Grass
Native No
Weed Yes
bulbous bluegrass (Poa bulbosa)
Poa bulbosa
Common Names bulbous bluegrass
Family Grass
Flower Color Green
Plant Type Grass
Native No
Weed Can be
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
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
annual sowthistle (Sonchus oleraceus)Sonchus oleraceus
Common Names annual sowthistle
Family Composites, Sunflower
Flower Color Yellow
Plant Type Forb
Native No
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
Native No
Weed Noxious
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
Common Tansy (Tanacetum vulgare)Tanacetum vulgare
Common Names common tansy
Family Composites, Sunflower
Flower Color Yellow
Plant Type Herb
Location McCall and many locations
Native No
Weed Noxious
dandelion (Taraxacum officinale)
Taraxacum officinale
Common Names dandelion
Family Composites, Sunflower
Flower Color Yellow
Plant Type Herb
Location McCall
Native No
Weed Yes
strawberry clover (Trifolium fragiferum ) Trifolium fragiferum
Common Names strawberry clover
Family Legume or Pea
Flower Color Light Pink
Plant Type Forb
Introduced Yes
Native No
Weed No
Red Clover (Trifolium pratense)
Trifolium pratense
Common Names red clover
Family Legume or Pea
Flower Color Pink
Plant Type Herb
Location McCall
Native No
Weed No
white clover, ladino clover, Dutch clover (Trifolium repens)Trifolium repens
Common Names ladino clover, white clover, Dutch clover
Family Legume or Pea
Native No
Weed Can be
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
Mullein (Verbascum thapsus)Verbascum thapsus
Common Names common mullein
Family Figwort or Snapdragon
Flower Color Yellow
Plant Type Herb
Location McCall
Native No
Weed Can be
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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