Common name

Scientific name

Designated for control in:

alyssum, hoary

Berteroa incana

All of Region 8

arrowhead, grass-leaved

Sagittaria graminea

All of Region 8

blackgrass

Alopecurus myosuroides

All of Region 8

blueweed

Echium vulgare

All of Region 8

bryony, white

Byronia alba

All of Region 8

bugloss, common

Anchusa officinalis

All of Region 8

bugloss, annual

Anchusa arvensis

All of Region 8

camelthorn

Alhagi maurorum

All of Region 8

chervil, wild

Anthriscus sylvestris

Region 8, except Clark County

cinquefoil, sulfur

Potentilla recta

Region 8, except Lewis County

cordgrass, smooth

Spartina alterniflora

Region 8, except bays and estuaries of Pacific County

cordgrass, common

Spartina anglica

All of Region 8

elodea, Brazilian

Egeria densa

Lewis County, only

fanwort

Cabomba caroliniana

Region 8, except T8N, R3W of Cowlitz County

fieldcress, Austrian

Rorippa austriaca

All of Region 8

floating heart, yellow

Nymphoides peltata

All of Region 8

gorse

Ulex europaeus

Region 8, except Pacific County

hawkweed, mouseear

Hieracium pilosella

All of Region 8

hawkweed, orange

Hieracium aurantiacum

Lewis County only

hawkweed, polar

Hieracium atratum

All of Region 8

hawkweed queen-devil

Hieracium glomeratum

All of Region 8

hawkweed, smooth

Hieracium laevigatum

All of Region 8

hawkweed, yellow

Hieracium caespitosum

All of Region 8

hedgeparsley

Torilis arvensis

All of Region 8

helmet, policeman's

Impatiens gladulifera

All of Region 8

indigobush

Amorpha fruticosa

All of Region 8, except within 200 feet of the Columbia River

knapweed, black

Centaurea nigra

Region 8, except Clark County

knapweed, brown

Centaurea jacea

Region 8, except Clark County

knapweed, diffuse

Centaurea diffusa

All of Region 8

knapweed, meadow

Centaurea jacea x nigra

Region 8, except Clark County

knapweed, Russian

Acroptilon repens

All of Region 8

knapweed, spotted

Centaurea biebersteinii

Region 8, except that portion of Lewis County below the ordinary high watermark of the Tilton River from Hwy. 508 to Lake Mayfield

Himalayan knotweed

Polygonum polystachyum

Lewis County only

Kochia

Kochia scoparia

All of Region 8

lepyrodiclis

Lepyrodiclis holosteoides

All of Region 8

loosestrife, garden

Lysimachia vulgaris

All of Region 8

loosestrife, purple

Lythrum salicaria

All of Region 8

loosestrife, wand

Lythrum virgatum

All of Region 8

nutsedge, yellow

Cyperus esculentus

All of Region 8

oxtongue, hawkweed

Picris hieracioides

Region 8, except Skamania County

parrotfeather

Myriophyllum aquaticum

Pacific, Lewis, and Skamania counties 

pepperweed, perennial

Lepidium latifolium

All of Region 8

primrose, water

Ludwigia hexapetala

Region 8, except T8N, R3W, S14 of Cowlitz County

saltcedar

Tamarix ramosissima

All of Region 8, unless intentionally established prior to 2004

sandbur, longspine

Cenchrus longispinus

All of Region 8

skeletonweed, rush

Chondrilla juncea

All of Region 8

sowthistle, perennial

Sonchus arvensis ssp. arvensis

All of Region 8

spurge, leafy

Euphorbia esula

All of Region 8

starthistle, yellow

Centaurea solstitialis

All of Region 8

swainsonpea

Sphaerophysa salsula

All of Region 8

thistle, musk

Carduus natans

All of Region 8

thistle, plumeless

Carduus acanthoides

All of Region 8

thistle, Scotch

Onopordum acanthium

All of Region 8

toadflax, Damlatian

Linaria dalmatica ssp. dalmatica

All of Region 8

watermilfoil, Eurasian

Myriophyllum spicatum

Region 8, except within 200 feet of the Columbia River