Washington State Noxious Weed General Distribution Maps
For more information, e-mail us or call (360) 902-2070.
Data for these general distribution maps was provided by county noxious weed control boards, Washington State University Cooperative Extension, state and federal agencies, tribes, and non-governmental organizations. No warranty is made by WSDA as to the accuracy, reliability, or completeness of this data for individual or aggregate use with other data.
Click on the common name below to view distribution map of weed.
| Common Name | Scientific Name |
| Absinth Wormwood | Artemisia absinthium |
| Austrian Fieldcress | Rorippa austriaca |
| Babysbreath | Gypsophila paniculata |
| Blackgrass | Alopecurus myosuroides |
| Black Henbane | Hyocyamus niger |
| Blueweed | Echium vulgare |
| Brazilian Elodea | Egeria densa |
| Buffalobur | Solanum rostratum |
| Bugloss, Annual | Anchusa arvensis |
| Bugloss, Common | Anchusa officinalis |
| Butterfly Bush | Buddleja davidii |
| Camelthorn | Alhagi maurorum |
| Cattail Nonnative Species | Typha spp. |
| Cereal Rye | Secale cereale |
| Common Barberry | Berberis vulgaris |
| Common Catsear | Hypochaeris radicata |
| Common Crupina | Crupina vulgaris |
| Common Fennel | Foeniculum vulgare |
| Common Groundsel | Senecio vulgaris |
| Common Reed (nonnative only) | Phragmites australis |
| Common St. Johnswort | Hypericum perforatum |
| Common Tansy | Tanacetum vulgare |
| Common Teasel | Dipsacus fullonum |
| Cordgrass, Common | Spartina anglica |
| Cordgrass, Dense Flower | Spartina densiflora |
| Cordgrass, Salt Meadow | Spartina patens |
| Cordgrass, Smooth | Spartina alterniflora |
| Curly-Leaf Pondweed | Potamogeton crispus |
| Dalmatian Toadflax | Linaria dalmatica ssp. dalmatica |
| Dyers Woad | Isatis tinctoria |
| Eggleaf Spurge | Euphorbia oblongata |
| English Hawthorn | Crataegus monogyna |
| English Ivy | Hedera helix |
| Eurasian Watermilfoil | Myriophyllum spicatum |
| Eurasian Watermilfoil Hybrid | Myriophyllum spicatum x M. sibiricum |
| Evergreen Blackberry | Rubus laciniatus |
| European Coltsfoot | Tussilago farfara |
| False Brome | Brachypodium sylvaticum |
| Fanwort | Cabomba caroliniana |
| Field Bindweed | Convolvulus arvensis |
| Floating Primrose-Willow | Ludwigia peploides |
| Flowering Rush | Butomus umbellatus |
| Fragrant Water Lily | Nymphaea odorata |
| French Broom | Genista monspessulana |
| Garlic Mustard | Alliaria petiolata |
| Giant Hogweed | Heracleum mantegazzianum |
| Goatsrue | Galega officinalis |
| Gorse | Ulex europaeus |
| Grass-Leaved Arrowhead | Sagittaria graminea |
| Hairy Whitetop | Lepidium appelianum |
| Hairy Willow-Herb | Epilobium hirsutum |
| Hawkweed, Orange | Hieracium aurantiacum |
| Hawkweed, Oxtongue | Picris hieracioides |
| Hawkweeds, Nonnative Species of the Meadow Subgenus | Hieracium, subgenus Pilosella |
| Hawkweeds, Nonnative Species of the Wall Subgenus | Hieracium, subgenus Hieracium |
| Herb-Robert | Geranium robertianum |
| Himalayan Blackberry | Rubus armeniacus |
| Hoary Alyssum | Berteroa incana |
| Hoary Cress | Lepidium draba |
| Houndstongue | Cynoglossum officinale |
| Hydrilla | Hydrilla verticillata |
| Indigobush | Amorpha fruticosa |
| Italian Arum | Arum italicum |
| Japanese Eelgrass | Zostera japonica |
| Johnsongrass | Sorghum halepense |
| Jointed Goatgrass | Aegilops cylindrica |
| Jubata Grass | Cortaderia jubata |
| Knapweed, Bighead | Centaurea macrocephala |
| Knapweed, Black | Centaurea nigra |
| Knapweed, Brown | Centaurea jacea |
| Knapweed, Diffuse | Centaurea diffusa |
| Knapweed, Meadow | Centaurea x moncktonii |
| Knapweed, Russian | Acroptilon repens |
| Knapweed, Spotted | Centaurea stoebe |
| Knapweed, Vochin | Centaurea nigrescens |
| Knotweed, Bohemian | Polygonum bohemicum |
| Knotweed, Combined | Polygonum spp. |
| Knotweed, Giant | Polygonum sachalinense |
| Knotweed, Himalayan | Polygonum polystachyum |
| Knotweed, Japanese | Polygonum cuspidatum |
| Kochia | Kochia scoparia |
| Kudzu | Pueraria montana var. lobata |
| Lawnweed | Soliva sessilis |
| Lesser Celandine | Ficaria verna |
| Longspine Sandbur | Cenchrus longispinus |
| Loosestrife, Garden | Lysimachia vulgaris |
| Loosestrife, Purple | Lythrum salicaria |
| Loosestrife, Wand | Lythrum virgatum |
| Malta Starthistle | Centaurea melitensis |
| Meadow Clary | Salvia pratensis |
| Medusahead | Taeniatherum caput-medusae |
| Old Man's Beard | Clematis vitalba |
| Oriental Clematis | Clematis orientalis |
| Oxeye Daisy | Leucanthemum vulgare |
| Pampas Grass | Cortaderia selloana |
| Parrotfeather | Myriophyllum aquaticum |
| Perennial Pepperweed | Lepidium latifolium |
| Perennial Sowthistle | Sonchus arvensis |
| Poison-Hemlock | Conium maculatum |
| Policeman's Helmet | Impatiens glandulifera |
| Puncturevine | Tribulus terrestris |
| Purple Starthistle | Centaurea calcitrapa |
| Ravenna Grass | Saccharum ravennae |
| Reed Canarygrass | Phalaris arundinacea |
| Reed Sweetgrass | Glyceria maxima |
| Ricefield Bulrush | Schoenoplectus mucronatus |
| Rush Skeletonweed | Chondrilla juncea |
| Russian Olive | Elaeagnus angustifolia |
| Sage, Clary | Salvia sclarea |
| Sage, Mediterranean | Salvia aethiopis |
| Saltcedar | Tamarix ramosissima |
| Scentless Mayweed | Matricaria perforata |
| Scotch Broom | Cytisus scoparius |
| Shiny Geranium | Geranium lucidum |
| Silverleaf Nightshade | Solanum elaeagnifolium |
| Small Flowered Jewelweed | Impatiens parviflora |
| Smoothseed Alfalfa Dodder | Cuscuta approximata |
| Spanish Broom | Spartium junceum |
| Spikeweed | Centromadia pungens |
| Spiny Cocklebur | Xanthium spinosum |
| Spotted Jewelweed | Impatiens capensis |
| Spurge Flax | Thymelaea passerina |
| Spurge Laurel | Daphne laureola |
| Spurge, Leafy | Euphorbia esula |
| Spurge, Myrtle | Euphorbia myrsinites |
| Sulfur Cinquefoil | Potentilla recta |
| Swainsonpea | Sphaerophysa salfula |
| Syrian Bean-Caper | Zygophyllum fabago |
| Tansy Ragwort | Senecio jacobaea |
| Texas Blueweed | Helianthus ciliaris |
| Thistle, Bull | Cirsium vulgare |
| Thistle, Canada | Cirsium arvense |
| Thistle, Italian | Carduus pycnocephalus |
| Thistle, Milk | Silybum marianum |
| Thistle, Musk | Carduus nutans |
| Thistle, Plumeless | Carduus acanthoides |
| Thistle, Scotch | Onopordum acanthium |
| Thistle, Slenderflower | Carduus tenuiflorus |
| Tree-of-heaven | Ailanthus altissima |
| Variable-leaf Milfoil | Myriophyllum heterophyllum |
| Velvetleaf | Abutilon theophrasti |
| Ventenata | Ventenata dubia |
| Water Primrose | Ludwigia hexapetala |
| White Bryony | Bryonia alba |
| White Cockle | Silene latifolia ssp. alba |
| Wild Carrot | Daucus carota |
| Wild Chervil | Anthriscus sylvestris |
| Wild Four o'clock | Mirabilis nyctaginea |
| Yellow Archangel | Lamiastrum galeobdolon |
| Yellow Flag Iris | Iris pseudacorus |
| Yellow Floating Heart | Nymphoides peltata |
| Yellow Nutsedge | Cyperus esculentus |
| Yellow Starthistle | Centaurea solstitialis |
| Yellow Toadflax | Linaria vulgaris |