CWMA Weed List

*This is a work in progress.  Please check back for more information.

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Common Name Scientific Name  External Links for More Information  WSNWCB Ranking OSWB Ranking CWMA Ranking
Velvetleaf Abutilon theophrasti CABIKing CountyWSNWCB B B B
Biddy-biddy Acaena novae-zelandiae not listed B W
Russian knapweed Acroptilon repens CABIKing CountyWSNWCB B B B
Jointed goatgrass Aegilops cylindrica CABIWSNWCB 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 CABIWSNWCB B A A
Garlic mustard Alliaria petiolata CABIISSGKing CountyWSNWCB 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 CABIISSG 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 CountyWSNWCB 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 CABIKing County, WSNWCB B B B
Flowering rush Butomus umbellatus King County, MSUNRCS A A A
Fanwort Cabomba caroliniana CABI, King CountyNAS, WiDNR B not listed W
Plumeless thistle Carduus acanthoides CABI, IlDNR, UCDavisWSNWCB B A A
Musk thistle Carduus nutans NISIC, USFSWSNWCB B B B
Italian thistle Carduus pycnocephalus BugwoodWikiCABI, IlDNR A B A
Slender-flowered thistle Carduus tenuiflorus BugwoodWikiIlDNR, 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, ODAUCDavis not listed A A
Brown knapweed Centaurea jacea KingCounty B not listed B
Bighead knapweed Centaurea macrocephala CABIKingCounty A W A
Spotted knapweed Centaurea maculosa (C. stoebe) BugwoodWiki, King County, USFS B B B
Black knapweed Centaurea nigra King CountyVRO 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 BugwoodWikiKing County, WSNWCB B B B
Field bindweed Convolvulus arvensis CABI, King County, USFS C B C
Jubata grass Cortaderia jubata APHISWSNWCB C B B
Pampass 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  BugwoodWikiCABI  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 CountyUSFS, 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  BugwoodWikiCABI,  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  BugwoodWikiCABI, 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  BugwoodWikiCABI, B not listed B
Goatsrue Galega officinalis  CABIKing County, ODA, ODA Risk A A A
French broom Genista monspessulana BugwoodWikiCABI, King CountyODA, 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  BugwoodWikiCABIWSNWCB A not listed A
Babysbreath Gypsophila paniculata C not listed C
Halogeton Halogeton glomeratus not listed B W
English ivy Hedera helix  BugwoodWikiCABI, King County C (listed cultivars) B B
Irish ivy Hedera hibernica C (listed cultivars) B B
Texas blueweed Helianthus ciliaris  CABI, King CountyWSNWCB 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 BugwoodWikiCABI, King CountyODA, 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 BugwoodWikiODA RiskWSNWCB 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 CountyODA 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, WRICWSNWCB 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)  CABIUSFS 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 CountyWSNWCB 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  CABIKing CountyWSNWCB 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 CountyODA, 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 CountyWSNWCB 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, CABIKing County, King County BMP, WSNWCB A B A
Silverleaf nightshade Solanum elaeagnifolium  Bugwood, CABIODA, 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