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Common Name	Scientific Name	More Information	WSNWCB Ranking	OSWB Ranking	CWMA Ranking
Velvetleaf	Abutilon theophrasti	CABI, King County,  WSNWCB	B	B	B
Biddy-biddy	Acaena novae-zelandiae		not listed	B	W
Russian knapweed	Acroptilon repens	CABI, King County,  WSNWCB	B	B	B
Jointed goatgrass	Aegilops cylindrica	CABI, WSNWCB	C	B	C
Ovate goatgrass	Aegilops geniculata		not listed	A	W
Barbed goatgrass	Aegilops triuncialis	ISSG	not listed	A	W
Tree of heaven	Ailanthus altissima	WSNWCB	C	B	C
Camelthorn	Alhagi pseudalhagi	CABI, WSNWCB	B	A	A
Garlic mustard	Alliaria petiolata	CABI, ISSG,  King County, WSNWCB	A	B	A
Blackgrass	Alopecurus myosuroides	CABI	C	not listed	W
Yellow tuft	Alyssum corsicum		not listed	A	W
Yellow tuft	Alyssum murale		not listed	A	W
Ragweed	Ambrosia artemisiifolia	CABI, ISSG	not listed	B	B
False indigo bush	Amorpha fruticosa	EDDMaps	B	B	B
Annual bugloss	Anchusa arvensis	King County, WSNWCB,	B	not listed	B
Common bugloss	Anchusa officinalis	King County, WSNWCB	B	B	B
Wild chervil	Anthriscus sylvestris	KingCounty, WSNWCB	B	not listed	B
Common  burdock	Arctium minus	E-Flora BC	not listed	not listed	C
Tall oatgrass	Arrhenatherum elatius				C
Absinth wormwood	Artemisia absinthium	E-Flora BC, King County,   WSNWCB	C	not listed	C
South African capeweed	Arctotheca calendula	CABI, Cal-IPC	not listed	W	W
Italian arum	Arum italicum	BugwoodWiki, WSNWCB	C	not listed	B
Giant reed	Arundo donax	BugwoodWiki, CABI,  Cal-IPC, ISSG	not listed	W	A
Common barberry	Berberis vulgaris	E-Flora BC, WSNWCB	C	not listed	W
Hoary alyssum	Berteroa incana		B	W	B
False brome	Brachypodium sylvaticum	CABI, E-Flora BC,  King County, WSNWCB	A	B	A
White bryonia	Bryonia alba	BugwoodWiki, WCNAWUS	B	A	A
Butterfly bush	Buddleja davidii	CABI, King County, WSNWCB	B	B	B
Flowering rush	Butomus umbellatus	King County, MSU,  NRCS	A	A	A
Fanwort	Cabomba caroliniana	CABI, King County, NAS, WiDNR	B	not listed	W
Plumeless thistle	Carduus acanthoides	CABI, IlDNR, UCDavis, WSNWCB	B	A	A
Musk thistle	Carduus nutans	NISIC, USFS,  WSNWCB	B	B	B
Italian thistle	Carduus pycnocephalus	BugwoodWiki, CABI, IlDNR	A	B	A
Slender-flowered thistle	Carduus tenuiflorus	BugwoodWiki, IlDNR, King County	A	B	A
Drooping sedge	Carex pendula	APHIS, Floridata	not listed	not listed	B
Smooth distaff thistle	Carthamus baeticus	ODA, WSNWCB	not listed	A	W
Woolly distaff thistle	Carthamus lanatus	CalFlora	not listed	A	W
Whitestem distaff thistle	Carthamus leucocaulos	ODA	not listed	W	W
Wild safflower	Carthamus oxyacantha		not listed	W	W
Longspine sandbur	Cenchrus longispinus	WSNWCB,	C	not listed	C
Purple starthistle	Centaurea calcitrapa	King County, NISIC, WSNWCB	A	A	A
Diffuse knapweed	Centaurea diffusa	CABI, King County, WSNWCB	B	B	B
Iberian starthistle	Centaurea iberica	CABI, ODA,  UCDavis	not listed	A	A
Brown knapweed	Centaurea jacea	KingCounty	B	not listed	B
Bighead knapweed	Centaurea macrocephala	CABI, KingCounty	A	W	A
Spotted knapweed	Centaurea maculosa (C. stoebe)	BugwoodWiki, King County, USFS	B	B	B
Black knapweed	Centaurea nigra	King County, VRO	B	not listed	B
Vochin knapweed	Centaurea nigrescens	King County, WSNWCB	A	not listed	A
Meadow knapweed	Centaurea pratensis (C. jacea x nigra)	King County, ODA	B	B	B
Yellow starthistle	Centaurea solstitialis	CABI, WSNWCB	B	B	B
Feather-headed knapweed	Centaurea trichocephala		not listed	W	W
Squarrose knapweed	Centaurea virgata	ODA	not listed	A	A
Rush skeletonweed	Chondrilla juncea	USDA, Weed Control	B	B	B
Chicory	Cichorium intybus	CABI			C
Canada thistle	Cirsium arvense	USFS, WSNWCB	C	B	C
Bull thistle	Cirsium vulgare		C	B	C
Oriental clematis	Clematis orientalis	King County	A	not listed	A
Old man’s beard	Clematis vitalba	CABI, King County	C	B	C
Poison hemlock	Conium maculatum	BugwoodWiki, King County, WSNWCB	B	B	B
Field bindweed	Convolvulus arvensis	CABI, King County, USFS	C	B	C
Jubata grass	Cortaderia jubata	APHIS, WSNWCB	C	B	B
Pampas grass	Cortaderia selloana	Thurston County	C	not listed	C
English hawthorn	Crataegus laevigata		not listed	W	C
Common crupina	Crupina vulgaris	CABI, King County	A	B	W
Smoothseed alfalfa dodder	Cuscuta approximata		C	not listed	C
Japanese dodder	Cuscuta japonica	CABI, ODA	not listed	A	W
Dodder	Cuscuta spp.		not listed	B	B
Houndstongue	Cynoglossum officinale	CABI, King County, ODA	B	B	B
Yellow nutsedge	Cyperus esculentus	CABI, King County	B	B	B
Purple nutsedge	Cyperus rotundus	BugwoodWiki, CABI, ODA, ODA Risk	not listed	A	A
Scotch broom	Cytisus scoparius	ODA, King County	B	B	B
Portuguese broom	Cytisus striatus		not listed	B	W
Spurge laurel	Daphne laureola	King County	B	B	B
Jimsonweed	Datura stramonium	BugwoodWiki, CABI			C
Wild carrot	Daucus carota	BugwoodWiki, CABI, Weed Control,	C	not listed	C
Cape ivy	Deleria odorata		not listed	W	W
Common teasel	Dipsacus fullonum	CABI, King County,  USFS,	C	not listed	C
Cutleaf teasel	Dipsacus laciniatus		not listed	B	W
Tower-of-jewels	Echium pininana		not listed	W	W
Paterson’s curse	Echium plantagineum	CABI, OSU	not listed	A	W
Blueweed	Echium vulgare		B	W	B
South American waterweed	Egeria densa		B	B	B
Russian olive	Elaeagnus angustifolia	BugwoodWiki, CABI, WSNWCB	C	not listed	C
Hairy willow-herb	Epilobium hirsutum		B	not listed	B
Spanish heath	Erica lusitanica		not listed	B	W
Filaree	Erodium cicutarium				C
Toothed spurge	Euphorbia dentata		not listed	W	W
Leafy spurge	Euphorbia esula	BugwoodWiki, CABI, King County	B	B	A
Mole spurge	Euphorbia lathyris		not listed	not listed	C
Myrtle spurge	Euphorbia myrsinites		B	B	B
Oblong spurge	Euphorbia oblongata	ODA, ODA Risk, WSNWCB	A	A	A
Bohemian knotweed	Fallopia × bohemica (Polygonum x bohemicum)	CABI, King County, WSNWCB	B	not listed	B
Japanese knotweed	Fallopia japonica (Polygonum cuspidatum)	CABI, King County	B	B	B
Giant knotweed	Fallopia sachalinensis (Polygonum sachalinensis);	CABI	B	B	B
Common fennel	Foeniculum vulgare	BugwoodWiki, CABI,	B	not listed	B
Goatsrue	Galega officinalis	CABI, King County, ODA, ODA Risk	A	A	A
French broom	Genista monspessulana	BugwoodWiki, CABI,  King County, ODA, WSNWCB	A	B	A
Shiny leaf geranium	Geranium lucidum	ODA, WSNWCB	A	B	A
Herb robert	Geranium robertianum	King County, WSNWCB	B	B	B
Reed sweetgrass	Glyceria maxima	BugwoodWiki, CABI,  WSNWCB	A	not listed	A
Babysbreath	Gypsophila paniculata		C	not listed	C
Halogeton	Halogeton glomeratus		not listed	B	W
English ivy	Hedera helix	BugwoodWiki, CABI, King County	C (listed cultivars)	B	B
Irish ivy	Hedera hibernica		C (listed cultivars)	B	B
Texas blueweed	Helianthus ciliaris	CABI, King County,  WSNWCB	A	not listed	A
Spikeweed	Hemizonia pungens		C	B	C
Giant hogweed	Heracleum mantegazzianum	BugwoodWiki, CABI, King County, ODA, ODA Risk	A	A	A
Polar hawkweed	Hieracium atratum		B	not listed	W
Orange hawkweed	Hieracium aurantiacum	BugwoodWiki, CABI, King County, ODA, ODA Risk	B	A	A
Meadow hawkweed	Hieracium caespitosum	CABI, King County	B	B	B
Whiplash hawkweed	Hieracium flagellare		B	not listed	W
Yellow hawkweed	Hieracium floribundum	BugwoodWiki, ODA Risk,  WSNWCB	B	A	A
Queen-devil hawkweed	Hieracium glomeratum		B	not listed	W
Common hawkweed	Hieracium lachenalii		B	not listed	B
Pale hawkweed	Hieracium lactucella		B	not listed	W
Smooth hawkweed	Hieracium laevigatum		B	not listed	W
Spotted hawkweed	Hieracium maculatum		B	not listed	W
Wall hawkweed	Hieracium murorum		B	not listed	W
Mouse-ear hawkweed	Hieracium pilosella	BugwoodWiki, CABI, King County BMP, ODA	B	A	A
King-devil hawkweed	Hieracium piloselloides	King County, ODA, WSNWCB	B	A	A
European hawkweed	Hieracium sabaudum		B	not listed	W
Hydrilla	Hydrilla verticillata	BugwoodWiki, CABI, King County, ODA	A	A	A
European frogbit	Hydrocharis morsus-ranae		not listed	W	W
Black henbane	Hyoscyamus niger		C	not listed	C
St. Johnswort	Hypericum perforatum	CABI, WRIC,  WSNWCB	C	B	C
Common catsear	Hypochaeris radicata	CABI, WRIC, WSNWCB	C	not listed	C
Spotted jewelweed	Impatiens capensis		not listed	W	W
Policeman’s helmet	Impatiens glandulifera	CABI, King County	B	B	B
Yellow flag iris	Iris pseudacorus	King County, USFS, WRIC	C	B	B
Dyers woad	Isatis tinctoria	BugwoodWiki, King County, ODA, USFS	A	B	A
Kochia	Kochia scoparia		B	B	B
Yellow archangel	Lamiastrum galeobdolon	King County, WSNWCB	B	B	B
Perennial peavine	Lathyrus latifolius		not listed	B	C
Lens-podded whitetop	Lepidium chalepensis		not listed	B	B
Hoary cress	Lepidium draba (Cardaria draba)		C	B	B
Perennial pepperweed	Lepidium latifolium	BugwoodWiki, CABI, USFS	B	B	B
Hairy whitetop	Lepidium pubescens (Cardaria pubescens)	CABI, USFS	C	B	C
Lepyrodiclis	Lepyrodiclis holosteoides		C	not listed	W
Oxeye daisy	Leucanthemum vulgare		C	not listed	C
South American spongeplant	Limnobium laevigatum		not listed	W	W
Dalmatian toadflax	Linaria dalmatica		B	B	B
Yellow toadflax	Linaria vulgaris		C	B	C
Water primrose	Ludwigia grandiflora		not listed	B	B
Water primrose	Ludwigia hexapetala		B	B	B
Water primrose	Ludwigia peploides	BugwoodWiki, CABI, King County, WSNWCB	A	B	A
Money plant	lunaria annua		not listed	not listed	C
Rose campion	Lychnus Coronaria		not listed	W	W
Garden loosestrife	Lysimachia vulgaris		B	not listed	W
Purple loosestrife	Lythrum salicaria		B	B	B
Wand loosestrife	Lythrum virgatum		B	not listed	W
Scentless mayweed	Matricaria perforata		C	not listed	C
Wild four o’clock	Mirabilis nyctaginea		A	not listed	W
Parrots feather	Myriophyllum aquaticum		B	B	B
Variable-leaf milfoil	Myriophyllum heterophyllum	CABI, King County,  WSNWCB	A	not listed	A
Eurasian watermilfoil	Myriophyllum spicatum		B	B	B
Matgrass	Nardus stricta		not listed	A	W
Fragrant water lily	Nymphaea odorata		C	not listed	C
Yellow floating heart	Nymphoides peltata	BugwoodWiki, King County, ODA, ODA Risk	B	A	A
Scotch thistle	Onopordum acanthium		B	B	B
Taurian thistle	Onopordum tauricum		not listed	A	W
Small broomrape	Orobanche minor	BugwoodWiki, CABI	not listed	A	A
African rue	Peganum harmala		not listed	A	W
Mile-a-minute	Persicaria perfoliata		not listed	W	W
Japanese butterbur	Petasites japonica		not listed	not listed	B
Reed canarygrass	Phalaris arundinacea		C	W	C
Ribbon grass	Phalaris arundinacea		C	B	C
Common reed	Phragmites australis ssp. Australis		B	B	B
American pokeweed	Phytolacca americana	BugwoodWiki	not listed	not listed	A
Hawkweed oxtongue	Picris hieracioides		B	not listed	B
Himalayan knotweed	Polygonum polystachyum		B	B	B
Curly-leaf pondweed	Potamogeton crispus		C	not listed	C
Sulfur cinquefoil	Potentilla recta		B	B	B
Kudzu	Pueraria lobata	BugwoodWiki, CABI, King County, ODA Risk	A	A	A
Lesser celandine	Ranunculus ficaria		B	B	B
Bridal Veil broom	Retama monosperma	Cal-IPC	not listed	not listed	A
Austrian fieldcress	Rorippa austriaca		C	not listed	C
Creeping yellow cress	Rorippa sylvestris	ODA	not listed	A	A
Sweet briar rose	Rosa rubiginosa		not listed	W	W
Himalayan blackberry	Rubus bifrons (R. armeniacus, R. procerus, R. discolor)		C	B	C
Evergreen blackberry	Rubus laciniatus		C	not listed	C
Ravenna grass	Saccharum ravennae	BugwoodWiki, WSNWCB	A	W	A
Grass-leaved arrowhead	Sagittaria graminea		B	not listed	W
Russian thistle	Salsola tragus				C
Mediterranean sage	Salvia aethiopis	BugwoodWiki, King County,  ODA, WSNWCB	A	not listed	A
Meadow clary	Salvia pratensis		A	not listed	W
Clary sage	Salvia sclarea		A	W	W
Ricefield bulrush	Schoenoplectus mucronatus	King County, WSNWCB	A	W	A
Cereal rye	Secale cereale		C	not listed	C
Tansy ragwort	Senecio jacobaea		B	B	B
Common groundsel	Senecio vulgaris		C	not listed	C
White cockle	Silene latifolia ssp. alba		C	not listed	C
Blessed milk thistle	Silybum marianum	BugwoodWiki, CABI,  King County, King County BMP, WSNWCB	A	B	A
Silverleaf nightshade	Solanum elaeagnifolium	Bugwood, CABI,  ODA, ODA Risk, WSNWCB	A	A	A
Buffalobur	Solanum rostratum		C	B	C
Sticky nightshade	Solanum sisymbriifolium		not listed	W	W
Field Burrweed	Soliva sessilis		C	not listed	W
Perennial sowthistle	Sonchus arvensis ssp. arvensis		C	not listed	C
Johnsongrass	Sorghum halepense	BugwoodWiki, CABI,  ODA, USFS,  WSNWCB	A	B	A
Smooth cordgrass	Spartina alterniflora		A	A	W
Common cordgrass	Spartina anglica		A	A	W
Dense-flowered cordgrass	Spartina densiflora		A	A	W
Saltmeadow cordgrass	Spartina patens		A	A	W
Spanish broom	Spartium junceum	BugwoodWiki, King County, King County BMP, WSNWCB	A	B	A
Swainsonpea	Sphaerophysa salsula		C	B	C
Medusahead rye	Taeniatherum caput-medusae		not listed	B	C
Saltcedar	Tamarix ramosissima		B	B	B
Common tansy	Tanacetum vulgare		C	not listed	C
Spurge flax	Thymelaea passerina		A	not listed	W
Salsify	Tragopogon dubius				C
European water chestnut	Trapa natans	BugwoodWiki, CABI, ODA,	not listed	A	A
Puncturevine	Tribulus terrestris		B	B	B
Coltsfoot	Tussilago farfara	BugwoodWiki, ODA,  USFS, WSNWCB	not listed	A	A
Narrowleaf cattail	Typha angustifolia		C	not listed	C
Southern cattail	Typha domingensis		C	not listed	W
Miniature cattail	Typha minima		C	not listed	W
White cattail	Typha x glauca		C	not listed	W
Gorse	Ulex europaeus	BugwoodWiki, CABI,  King County, King County BMP, WSNWCB	B	B	A
Ventenata	Ventenata dubia		not listed	W	C
Common mullein	Verbascum thapsus		not listed	not listed	C
Vinca major	Vinca major L.		Not listed	Not listed	C
Spiny cocklebur	Xanthium spinosum		C	B	C
Japanese eelgrass	Zostera japonica		C	W	W
Syrian bean-caper	Zygophyllum fabago	BugwoodWiki, King County, ODA, WSNWCB	A	A	A