Washington State Noxious Weed Control Board
Region 1 Class B Weed Designates
Region 1 contains all lands lying within the boundaries of Clallam and Jefferson Counties.
| Common name | Scientific name | Designated for control in: |
| Austrian fieldcress | Rorippa austriaca | All of Region 1 |
| Annual bugloss | Anchusa arvensis | All of Region 1 |
| Blueweed | Echium vulgare | All of Region 1 |
| Brazilian elodea | Egeria densa | Clallam County only |
| Camelthorn | Alhagi maurorum | All of Region 1 |
| Cordgrass, common | Spartina anglica | All of Region 1 |
| Cordgrass, smooth | Spartina alterniflora | All of Region 1 |
| Dalmatian toadflax | Linaria dalmatica ssp. dalmatica | All of Region 1 |
| Eurasian watermilfoil | Myriophyllum spicatum | All of Region 1 |
| Fanwort | Cabomba caroliniana | All of Region 1 |
| Gorse | Ulex europaeus | All of Region 1 |
| Hawkweed, mouseear | Hieracium pilosella | All of Region 1 |
| Hawkweed, orange | Hieracium aurantiacum | All of Region 1 |
| Hawkweed, polar | Hieracium atratum | All of Region 1 |
| Hawkweed, smooth | Hieracium laevigatum | All of Region 1 |
| Hawkweed, queendevil | Hieracium glomeratum | All of Region 1 |
| Hawkweed, yellow | Hieracium caespitosum | All of Region 1 |
| Hawkweed oxtongue | Picris hieracioides | All of Region 1 |
| Hedgeparsley | Torilis arvensis | All of Region 1 |
| Hoary alyssum | Berteroa incana | All of Region 1 |
| Indigobush | Amorpha fruticosa | All of Region 1 |
| Knapweed, black | Centaurea nigra | All of Region 1 |
| Knapweed, brown | Centaurea jacea | All of Region 1 |
| Knapweed, diffuse | Centaurea diffusa | All of Region 1 |
| Knapweed, meadow | Centaurea jacea x nigra | All of Region 1 |
| Knapweed, Russian | Acroptilon repends | All of Region 1 |
| Knapweed, spotted | Centaurea biebersteinii | All of Region 1 |
| Parrotfeather | Myriophyllum aquaticum | All of Region 1 |
| Kochia | Kochia scoparia | Clallam County only |
| Leafy spurge | Euphorbia esula | All of Region 1 |
| Lepyrodiclis | Lepyrodiclis holosteoides | All of Region 1 |
| Longspine sandbur | Cenchrus longispinus | All of Region 1 |
| Loosestrife, garden | Lysimachia vulgaris | All of Region 1 |
| Loosestrife, purple | Lythrum salicaria | All of Region 1 |
| Loosestrife, wand | Lythrum virgatum | All of Region 1 |
| Perennial sowthistle | Sonchus arvensis ssp. arvensis | All of Region 1 |
| Policeman's helmet | Impatiens glandulifera | All of Region 1 |
| Puncturevine | Tribulus terrestris | Clallam County only |
| Rush skeletonweed | Chondrilla juncea | All of Region 1 |
| Saltcedar | Tamarix ramosissima | All of Region 1 |
| Sulfur cinquefoil | Potentilla recta | All of Region 1 |
| Swainsonpea | Sphaerophysa salsula | All of Region 1 |
| Thistle, musk | Carduus natans | All of Region 1 |
| Thistle, plumeless | Carduus acanthoides | All of Region 1 |
| Thistle, Scotch | Onopordum acanthium | All of Region 1 |
| Water primrose | Ludwigia hexapetala | All of Region 1 |
| White bryony | Bryonia alba | All of Region 1 |
| Wild chervil | Anthriscus sylvestris | All of Region 1 |
| Yellow floating heart | Nymphoides peltata | All of Region 1 |
| Yellow nutsedge | Cyperus esculentus | All of Region 1 |
| Yellow starthistle | Centaurea solstitialis | All of Region 1 |