Common name

Scientific name

Designated for control in:

alysum, hoary

Berteroa incana

All of Region 5

arrowhead, grass-leaved

Sagittaria graminea

All of Region 5 except Mason Lake in Mason County

blackgrass

Alopecurus myosuroides

All of Region 5

blueweed

Echium vulgare

All of Region 5

bryony, white

Byronia alba

All of Region 5

bugloss, common

Anchusa officinalis

All of Region 5

bugloss, annual

Anchusa arvensis

All of Region 5

camelthorn

Alhagi maurorum

All of Region 5

chervil, wild

Anthriscus sylvestris

Region 5, except those portions of Thurston County within T15, 16, 17N, R2, 3, 4W

cinquefoil, sulfur

Potentilla recta

Region 5, except Thurston and Pierce counties

cordgrass, smooth

Spartina alterniflora

All of Region 5

cordgrass, common

Spartina anglica

All of Region 5

elodea, Brazilian

Egeria densa

King County, except lakes Washington, Sammamish, Union, and Fenwick

fanwort

Cabomba caroliniana

All of Region 5

fieldcress, Austrian

Rorippa austriaca

All of Region 5

floating heart, yellow

Nymphoides peltata

All of Region 5

gorse

Ulex europaeus

Thurston, Kitsap, Pierce, and King counties

hawkweed, mouseear

Hieracium pilosella

Region 5, except Thurston County

Thurston County lying within:

• T17N, R1W, S31

• T16N, R2W, S30, W1/2

• T16N, R3W, S25, SE1/3

• T16N, R3W, S36, N1/2

• T16N, R2W, S31, NW1/4

hawkweed, orange

Hieracium aurantiacum

Thurston and King counties only

hawkweed, polar

Hieracium atratum

Region 5 outside the boundaries of Mt. Ranier National Park

hawkweed queen-devil

Hieracium glomeratum

All of Region 5

hawkweed, smooth

Hieracium laevigatum

All of Region 5

hawkweed, yellow

Hieracium caespitosum

All of Region 5

hedgeparsley

Torilis arvensis

All of Region 5

helmet, policeman's

Impatiens gladulifera

Region 5, except Pierce and Thurston counties

indigobush

Amorpha fruticosa

All of Region 5

knapweed, black

Centaurea nigra

Region 5, except that area below the ordinary highwater mark of the Nisqually River, beginning at Alder Dam and downstream to the mouth of the Nisqually River in Pierce and Thurston counties

knapweed, brown

Centaurea jacea

Region 5, except that area below the ordinary highwater mark of the Nisqually River, beginning at Alder Dam and downstream to the mouth of the Nisqually River in Pierce and Thurston counties

knapweed, diffuse

Centaurea diffusa

All of Region 5

knapweed, meadow

Centaurea jacea x nigra

Region 5, except that area below the ordinary highwater mark of the Nisqually River, beginning at Alder Dam and downstream to the mouth of the Nisqually River in Pierce and Thurston counties

knapweed, Russian

Acroptilon repens

All of Region 5

knapweed, spotted

Centaurea biebersteinii

All of Region 5

Kochia

Kochia scoparia

All of Region 5

lepyrodiclis

Lepyrodiclis holosteoides

All of Region 5

loosestrife, garden

Lysimachia vulgaris

Region 5, except King County

Those portions of King County lying :

• north of 1-90, and

• east of the line extending from SR522 to SR202 to E. Lake Sammamish Parkway

• west of 1-5, including Vashon Island, and

• south of 1-90 and east and south of I-405 to the county line

loosestrife, purple

Lythrum salicaria

Grays Harbor, Mason, Kitsap, and Thurston counties and those portions of King County lying :

• north of 1-90, and

• east of the line extending from SR522 to SR202 to E. Lake Sammamish Parkway

• west of 1-5, including Vashon Island, and

• south of 1-90 and east and south of I-405 to the county line

loosestrife, wand

Lythrum virgatum

Region 5, except King County and those portions of King County lying :

• north of 1-90, and

• east of the line extending from SR522 to SR202 to E. Lake Sammamish Parkway

• west of 1-5, including Vashon Island, and

• south of 1-90 and east and south of I-405 to the county line

nutsedge, yellow

Cyperus esculentus

All of Region 5

oxtongue, hawkweed

Picris hieracioides

All of Region 5

parrotfeather

Myriophyllum aquaticum

All of Region 5

pepperweed, perennial

Lepidium latifolium

All of Region 5

primrose, water

Ludwigia hexapetala

All of Region 5

ragwort, tansy

Senecio jacobaea

in Region 5, that portion of Pierce County lying south or east of a boundary beginning at the White River and State Highway 410, then:

• west along State Highway 410 to intersection with State Highway 162 (Orting) to intersection with Orville Road, and

• south along Orville Road to intersection with Kapowsin Highway (304th Street East), and

• west following Kapowsin Highway to intersection with State Route 7, and

• south along State Road 7 to intersection State Route 702, then

• west along Route 702 to intersection with State Route 507, then

• southwest along State Route 507 to intersection with the Nisqually River

saltcedar

Tamarix ramosissima

All of Region 5, unless intentionally established prior to 2004

sandbur, longspine

Cenchrus longispinus

All of Region 5

skeletonweed, rush

Chondrilla juncea

All of Region 5

sowthistle, perennial

Sonchus arvensis ssp. arvensis

Region 5, except for sections 28, 29, 30, 31, 32, and 33 in T19N, R1E of Thurston and Pierce counties

spurge, leafy

Euphorbia esula

All of Region 5

starthistle, yellow

Centaurea solstitialis

All of Region 5

swainsonpea

Sphaerophysa salsula

All of Region 5

thistle, musk

Carduus natans

All of Region 5

thistle, plumeless

Carduus acanthoides

All of Region 5

thistle, Scotch

Onopordum acanthium

All of Region 5

toadflax, Damlatian

Linaria dalmatica ssp. dalmatica

All of Region 5