Class B Weeds
These species are established in some regions of Washington, but are of limited distribution or not present in other regions of the state. Because of differences in distribution, treatment of Class B weeds varies between regions of the state. In regions where a Class B is unrecorded or of limited distribution, prevention of seed production is required.
In these areas, the weed is a "Class B designate," meaning it is designated for control by state law. In regions where a Class B species is already abundant or widespread, control is a local option. In these areas the weed is a "Class B non-designate," with containment, gradual reduction, and prevention of further spread being the chief goals
Washington State Noxious Weed List - Class B Weeds
Common Name | Scientific Name |
---|---|
Annual bugloss | Anchusa arvensis |
Austrian fieldcress | Rorippa austriaca |
Black knapweed | Centaurea nigra |
Blackgrass | Alopecurus myosuroides |
Blueweed | Echium vulgare |
Bohemian knotweed | Polygonum bohemicum |
Brazilian elodea | Egeria densa |
Brown knapweed | Centaurea jacea |
Camelthorn | Alhagi maurorum |
Common bugloss | Anchusa officinalis |
Common catsear | Hypochaeris radicata |
Common cordgrass | Spartina anglica |
Dalmatian toadflax | Linaria dalmatica ssp. Dalmatica |
Diffuse knapweed | Centaurea diffusa |
Eurasian watermilfoil | Myriophyllum spicatum |
Fanwort | Cabomba caroliniana |
Garden loosestrife | Lysimachia vulgaris |
Giant knotweed | Polygonum sachalinense |
Gorse | Ulex europaeus |
Grass-leaved arrowhead | Sagittaria graminea |
Hedgeparsley | Torilis arvensis |
Herb-robert | Geranium robertianum |
Himalayan knotweed | Polygonum polystachyum |
Hoary alyssum | Berteroa incana |
Houndstongue | Cynoglossum officinale |
Indigobush | Amorpha fruticosa |
Japanese knotweed | Polygonum cuspidatum |
Kochia | Kochia scoparia |
Leafy spurge | Euphorbia esula |
Lepyrodiclis | Lepyrodiclis holosteoides |
Longspine sandbur | Cenchrus longispinus |
Meadow knapweed | Centaurea pratensis |
Mouseear hawkweed | Hieracium pilosella |
Musk thistle | Carduus nutans |
Myrtle spurge | Euphorbia myrsinites |
Orange hawkweed | Hieracium aurantiacum |
Oxeye daisy | Leucanthemum vulgare |
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 |
Puncturevine | Tribulus terrestris |
Purple loosestrife | Lythrum salicaria |
Queendevil hawkweed | Hieracium glomeratum |
Rush skeletonweed | Chondrilla juncea |
Russian knapweed | Acroptilon repens |
Saltcedar | Tamarix ramosissima |
Scotch broom | Cytisus scoparius |
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 |
Wand loosestrife | Lythrum virgatum |
Water primrose | Ludwigia hexapetala |
White bryony | Bryonia alba |
Wild carrot | Daucus carota |
Wild chervil | Anthriscus sylvestris |
Yellow floating heart | Nymphoides peltata |
Yellow hawkweed | Hieracium caespitosum |