Washington Noxious Weed List

Invasive Species List Sources

This source is used to designate the following species as invasive.
Scientific Name Common Name Type Subtype Extent Risk of Introduction Link
Aegilops cylindrica jointed goatgrass plant grass widespread n/a (already in CA)
Alopecurus myosuroides blackgrass plant grass limited n/a (already in CA)
Amorpha fruticosa indigobush plant woody limited n/a (already in CA)
Anchusa arvensis annual bugloss plant herbaceous limited n/a (already in CA)
Anthriscus sylvestris wild chervil plant herbaceous not present high
Bryonia alba white bryony plant herbaceous not present moderate
Butomus umbellatus flowering rush plant herbaceous not present high
Centaurea jacea brown knapweed plant herbaceous limited n/a (already in CA)
Centaurea macrocephala bighead knapweed plant herbaceous not present moderate
Centaurea nigra black knapweed plant herbaceous limited n/a (already in CA)
Chaenorhinum minus dwarf snapdragon plant herbaceous not present moderate
Crassula helmsii Australian swamp stonecrop plant herbaceous not present low
Cuscuta approximata smoothseed alfalfa dodder plant herbaceous limited n/a (already in CA)
Daucus carota wild carrot plant herbaceous widespread n/a (already in CA)
Echium vulgare common viper's bugloss plant herbaceous not present high
Epilobium hirsutum hairy willow herb plant herbaceous not present high
Glossostigma diandrum mud mat plant herbaceous not present low
Hedera hibernica English ivy plant woody not present high
Hieracium atratum polar hawkweed plant herbaceous not present low
Hieracium aurantiacum orange hawkweed plant herbaceous not present high View Scorecard
Hieracium glomeratum queen devil hawkweed plant herbaceous not present low
Hieracium laevigatum smooth hawkweed plant herbaceous not present low
Hydrocharis morsus-ranae European frog-bit plant herbaceous not present moderate
Lepidium latifolium perennial pepperweed plant herbaceous widespread n/a (already in CA) View Scorecard
Lepyrodiclis holosteoides false jagged-chickweed plant herbaceous not present low
Ludwigia grandiflora large flower primrose willow plant herbaceous limited n/a (already in CA)
Lysimachia vulgaris garden loosestrife plant herbaceous not present high
Mirabilis nyctaginea wild four o-clock plant herbaceous limited n/a (already in CA)
Murdannia keisak marsh dew flower plant herbaceous not present moderate
Najas minor slender-leaved naiad plant herbaceous not present moderate
Nymphaea odorata fragrant waterlily plant herbaceous limited n/a (already in CA)
Phalaris arundinacea reed canarygrass plant grass limited n/a (already in CA)
Picris hieracioides hawkweed oxtongue plant herbaceous not present moderate
Polygonum x bohemicum Bohemian knotweed plant herbaceous not present moderate
Proboscidea louisianica unicorn-plant plant herbaceous widespread n/a (already in CA)
Sagittaria graminea grass-leaved arrowhead plant herbaceous not present high
Salvia pratensis meadow clary plant herbaceous not present moderate
Salvia sclarea clary sage plant herbaceous not present moderate
Secale cereale cereal rye plant grass widespread n/a (already in CA)
Silene latifolia ssp. alba bladder campion plant herbaceous limited n/a (already in CA)
Soliva sessilis lawnweed plant herbaceous widespread n/a (already in CA)
Sorghum halepense johnsongrass plant grass widespread n/a (already in CA) View Scorecard
Thymelaea passerina spurge flax plant herbaceous not present moderate
Trapa bicornis water caltrap plant herbaceous not present low
Utricularia inflata swollen bladderwort plant herbaceous not present moderate