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Malheur Experiment Station
Oregon State University

Plants by Scientific Name where Weed includes Noxious


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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
Dogbane, spreading dogbane (Apocynum androsaemifolium)Apocynum androsaemifolium
Common Names spreading dogbane, dogbane
Family Dogbane
Flower Color Pink
Plant Type Herb
Short Description Poisonous juice.
Native Yes
Weed Noxious
hemp dogbane (Apocynum cannabinum L.)Apocynum cannabinum L.
Common Names hemp dogbane
Family Dogbane
Flower Color White
Weed Noxious
hoary cress, whitetop (Cardaria spp.)
Cardaria spp.
Common Names hoary cress, whitetop
Family Mustard
Flower Color White
Plant Type Herb
Native No
Weed Noxious
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
water hemlock (Cicuta douglasii)Cicuta douglasii
Common Names water hemlock
Family Parsley
Flower Color White
Plant Type Herb
Short Description Poisionous plant, wet soil. Leaves: 1-3 times pinnate
Location McCall
Weed Noxious
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
Yellow Nutsedge (Cyperus esculentus)Cyperus esculentus
Common Names yellow nutsedge
Family Sedge
Flower Color Yellowish
Plant Type Sedge
Native No
Weed Noxious
Flixweed (Descurainia sophia)
Descurainia sophia
Common Names flixweed
Family Mustard
Flower Color Yellow
Plant Type Forb
Native No
Weed Noxious
Kochia (Kochia scoparia)


Kochia scoparia
Common Names kochia
Family Goosefoot
Plant Type Forb
Native No
Weed Noxious
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
Dalmatian toadflax (Linaria dalmatica)Linaria dalmatica
Common Names Dalmatian toadflax
Family Figwort or Snapdragon
Plant Type Forb
Weed Noxious
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
Purple Loosestrife (Lythrum salicaria)Lythrum salicaria
Common Names purple loosestrife
Family Loosestrife
Flower Color Purple
Plant Type Herb
Native No
Weed Noxious
Scotch thistle (Onopordum acanthuim) Onopordum acanthium
Common Names Scotch thistle
Family Composites, Sunflower
Flower Color Purple
Plant Type Forb
Native No
Weed Noxious
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
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

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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