Common name

Scientific name

Designated for control in:

arrowhead, grass-leaved

Sagittaria graminea

All of Region 4

blackgrass

Alopecurus myosuroides

Ferry, Stevens, and Pend Oreille counties of Region 4

blueweed

Echium vulgare

All of Region 4

broom, Scotch

Cytisus scoparius

All of Region 4

bryony, white

Byronia alba

All of Region 4

bugloss, common

Anchusa officinalis

All of Region 4, except for Stevens and Spokane counties

bugloss, annual

Anchusa arvensis

All of Region 4

camelthorn

Alhagi maurorum

All of Region 4

carrot, wild

Daucus carota

Spokane and Ferry counties of Region 4 (except where intentionally cultivated)

catsear, common

Hypochaeris radicata

All of Region 4

chervil, wild

Anthriscus sylvestris

All of Region 4

cinquefoil, sulfur

Potentilla recta

Region 4, except Stevens, Ferry, and Pend Oreille counties

cordgrass, smooth

Spartina alterniflora

All of Region 4

cordgrass, common

Spartina anglica

All of Region 4

elodea, Brazilian

Egeria densa

All of Region 4

fanwort

Cabomba caroliniana

All of Region 4

fieldcress, Austrian

Rorippa austriaca

All of Region 4

floating heart, yellow

Nymphoides peltata

All of Region 4, except the Spokane River between Long Lake Dam and Nine Mile Dam

gorse

Ulex europaeus

All of Region 4

hawkweed, mouseear

Hieracium pilosella

All of Region 4

hawkweed, orange

Hieracium aurantiacum

Ferry County only

hawkweed, polar

Hieracium atratum

All of Region 4

hawkweed queen-devil

Hieracium glomeratum

Ferry County only

hawkweed, smooth

Hieracium laevigatum

All of Region 4

hawkweed, yellow

Hieracium caespitosum

Region 4 except Stevens and Pend Oreille counties

hedgeparsley

Torilis arvensis

All of Region 4

helmet, policeman's

Impatiens gladulifera

All of Region 4

herb-Robert

Geranium robertianum

All of Region 4

indigobush

Amorpha fruticosa

All of Region 4

knapweed, black

Centaurea nigra

All of Region 4

knapweed, brown

Centaurea jacea

All of Region 4

knapweed, meadow

Centaurea jacea x nigra

All of Region 4

knapweed, Russian

Acroptilon repens

Region 4, except that area lying within the boundaries of the Colville Indian Reservation within Ferry County

knapweed, spotted

Centaurea biebersteinii

Ferry County only

knotweed, Bohemian

Polygonum bohemicum

Pend Oreille County only

knotweed, giant

Polygonum sachalinense

Pend Oreille County only

knotweed, Himalayan

Polygonum polystachyum

Pend Oreille County only

knotweed, Japanese

Polygonum cuspidatum

Pend Oreille County only

Kochia

Kochia scoparia

Pend Oreille County only

lepyrodiclis

Lepyrodiclis holosteoides

All of Region 4

loosestrife, garden

Lysimachia vulgaris

All of Region 4

loosestrife, purple

Lythrum salicaria

All of Region 4

loosestrife, wand

Lythrum virgatum

All of Region 4

nutsedge, yellow

Cyperus esculentus

All of Region 4

oxtongue, hawkweed

Picris hieracioides

All of Region 4

parrotfeather

Myriophyllum aquaticum

All of Region 4

pepperweed, perennial

Lepidium latifolium

All of Region 4

primrose, water

Ludwigia hexapetala

All of Region 4

ragwort, tansy

Senecio jacobaea

All of Region 4

saltcedar

Tamarix ramosissima

All of Region 4, unless intentionally established prior to 2004

sandbur, longspine

Cenchrus longispinus

All of Region 4

skeletonweed, rush

Chondrilla juncea

Stevens County north of Township 33 North of Region 4

Ferry and Pend Oreille counties

sowthistle, perennial

Sonchus arvensis ssp. arvensis

All of Region 4

spurge, leafy

Euphorbia esula

All of Region 4

spurge, myrtle

Euphorbia myrsinites

Pend Oreille County only

starthistle, yellow

Centaurea solstitialis

Region 4, except those areas within Stevens County bounded by a line beginning at the intersection of State Highway 20 and State Highway 25, then:

•  north to intersection with Pinkston Creek Road

• east along Pinkston Creek Road to intersection with Highland Loop Road

• south along Highland Loop Road to intersection with State Highway 20, then

• west along State Highway 20 to intersection with State Highway 25

swainsonpea

Sphaerophysa salsula

All of Region 4

thistle, musk

Carduus natans

Spokane and Pend Oreille counties

thistle, plumeless

Carduus acanthoides

Region 4, except those areas within Stevens County lying north of State Highway 20

thistle, Scotch

Onopordum acanthium

All of Region 4

watermilfoil, Eurasian

Myriophyllum spicatum

in water bodies of public access, except the Pend Oreille River, in Pend Oreille County