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King County, Washington Noxious Weed Identification and Control

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Class B Noxious Weeds, 2008 List
(control required in King County)

Common Name Scientific Name
annual bugloss Anchusa arvensis
Austrian fieldcress Rorippa austriaca
black knapweed Centaurea nigra
blackgrass Alopecurus myosuroides
blueweed, viper's bugloss Echium vulgare
Brazilian elodea Egeria densa
brown knapweed Centaurea jacea
camelthorn Alhagi maurorum
common bugloss Anchusa officinalis
common reed (non-native genotypes) Phragmites australis
Dalmatian toadflax  Linaria dalmatica ssp. dalmatica
diffuse knapweed Centaurea diffusa
fanwort Cabomba caroliniana
garden loosestrife Lysimachia vulgaris
gorse Ulex europaeus
grass-leaved arrowhead Sagittaria graminea
hoary alyssum Berteroa incana
kochia Kochia scoparia
leafy spurge Euphorbia esula
lepyrodiclis Lepyrodiclis holosteoides
longspine sandbur Cenchrus longispinus
meadow knapweed Centaurea jacea x nigra
mouseear hawkweed Hieracium pilosella
musk thistle Carduus nutans
orange hawkweed Hieracium aurantiacum
oxtongue hawkweed Picris hieracioides
parrotfeather Myriophyllum aquaticum
perennial pepperweed Lepidium latifolium
perennial sowthistle Sonchus arvensis
plumeless thistle Carduus acanthoides
polar hawkweed Hieracium atratum
policeman's helmet Impatiens glandulifera
purple loosestrife Lythrum salicaria
queen-devil hawkweed Hieracium glomeratum
rush skeletonweed Chondrilla juncea
Russian knapweed Acroptilon repens
saltcedar Tamarix ramosissima Tamarix ramosissima
Scotch thistle Onopordum acanthium
smooth cordgrass Spartina alterniflora
smooth hawkweed Hieracium laevigatum
spotted knapweed Centaurea biebersteinii
sulfur cinquefoil Potentilla recta
swainsonpea Sphaerophysa salsula
tansy ragwort Senecio jacobaea
water primrose Ludwigia hexapetala
white bryony Bryonia alba
wild chervil Anthriscus sylvestris
yellow floating heart Nymphoides peltata
yellow hawkweed Hieracium caespitosum
yellow nutsedge Cyperus esculentus
yellow starthistle Centaurea solstitialis

 

Related Information:

Agencies

Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact a staff member at the King County Noxious Weed Control Program, please call 206-296-0290 or by reach them by email.