Plant Species Reported to be Invasive in Natural Areas List

Source: Pacific Northwest Exotic Pest Plant Council, 1998

Source URL: http://depts.washington.edu/waipc/pnwnoxiousweedlist.shtml

208 Species

Subject Name Scientific Name Family U.S. Nativity
kudzu Pueraria montana var. lobata (Willd.) Maesen & S. Almeida Fabaceae Exotic
small broomrape Orobanche minor Smith Orobanchaceae Exotic
Canada thistle Cirsium arvense (L.) Scop. Asteraceae Exotic
garlic mustard Alliaria petiolata (Bieb.) Cavara & Grande Brassicaceae Exotic
musk thistle, nodding thistle Carduus nutans L. Asteraceae Exotic
spotted knapweed Centaurea stoebe ssp. micranthos (Gugler) Hayek Asteraceae Exotic
Brazilian waterweed, Brazilian elodea Egeria densa Planch. Hydrocharitaceae Exotic
English ivy Hedera helix L. Araliaceae Exotic
hydrilla Hydrilla verticillata (L. f.) Royle Hydrocharitaceae Exotic
purple loosestrife Lythrum salicaria L. Lythraceae Exotic
parrotfeather Myriophyllum aquaticum (Vell.) Verdc. Haloragaceae Exotic
Eurasian watermilfoil Myriophyllum spicatum L. Haloragaceae Exotic
common reed Phragmites australis (Cavanilles) Trinius ex Steudel Poaceae
johnsongrass Sorghum halepense (L.) Pers. Poaceae Exotic
common mullein Verbascum thapsus L. Scrophulariaceae Exotic
bull thistle Cirsium vulgare (Savi) Ten. Asteraceae Exotic
spiny plumeless thistle, plumeless thistle Carduus acanthoides L. Asteraceae Exotic
European water chestnut Trapa natans L. Trapaceae Exotic
yellow toadflax Linaria vulgaris P. Mill. Scrophulariaceae Exotic
puncturevine Tribulus terrestris L. Zygophyllaceae Exotic
silverleaf nightshade Solanum elaeagnifolium Cavanaugh Solanaceae Native
field bindweed Convolvulus arvensis L. Convolvulaceae Exotic
gorse, common gorse Ulex europaeus L. Fabaceae Exotic
Mediterranean sage Salvia aethiopis L. Lamiaceae Exotic
poison hemlock Conium maculatum L. Apiaceae Exotic
squarrose knapweed Centaurea virgata Lam. Asteraceae Exotic
Russian knapweed Rhaponticum repens (L.) Hidalgo Asteraceae Exotic
yellow starthistle Centaurea solstitialis L. Asteraceae Exotic
rush skeletonweed Chondrilla juncea L. Asteraceae Exotic
Scotch broom Cytisus scoparius (L.) Link Fabaceae Exotic
common St. Johnswort Hypericum perforatum L. Hypericaceae Exotic
common crupina Crupina vulgaris Cass. Asteraceae Exotic
slenderflower thistle Carduus tenuiflorus W. Curtis Asteraceae Exotic
meadow hawkweed Hieracium caespitosum Dumort. Asteraceae Exotic
sulfur cinquefoil Potentilla recta L. Rosaceae Exotic
Scotch thistle Onopordum acanthium L. Asteraceae Exotic
Italian plumeless thistle Carduus pycnocephalus L. Asteraceae Exotic
blessed milkthistle, milk thistle Silybum marianum (L.) Gaertn. Asteraceae Exotic
diffuse knapweed Centaurea diffusa Lam. Asteraceae Exotic
goatsrue Galega officinalis L. Fabaceae Exotic
giant hogweed Heracleum mantegazzianum Sommier & Levier Apiaceae Exotic
Dyer's woad Isatis tinctoria L. Brassicaceae Exotic
velvetleaf Abutilon theophrasti Medik Malvaceae Exotic
jointed goatgrass Aegilops cylindrica Host Poaceae Exotic
ovate goatgrass Aegilops geniculata Roth Poaceae Exotic
barb goatgrass Aegilops triuncialis L Poaceae Exotic
camelthorn Alhagi maurorum Medik Fabaceae Exotic
slender meadow foxtail Alopecurus myosuroides Huds. Poaceae Exotic
common ragweed Ambrosia artemisiifolia L. Asteraceae
indigobush Amorpha fruticosa L. Fabaceae Native
redroot pigweed Amaranthus retroflexus L. Amaranthaceae Exotic
skeletonleaf bursage Ambrosia tomentosa Nutt. Asteraceae Native
small bugloss Anchusa arvensis (L.) Bieb Boraginaceae Exotic
common bugloss Anchusa officinalis L. Boraginaceae Exotic
wild chervil Anthriscus sylvestris (L.) Hoffmann Apiaceae Exotic
absinth wormwood Artemisia absinthium L. Asteraceae Exotic
showy milkweed Asclepias speciosa Torr Asclepiadaceae Native
wild oat Avena fatua L. Poaceae Exotic
hoary alyssum Berteroa incana (L.) DC Brassicaceae Exotic
nodding beggarticks Bidens cernua L Asteraceae Native
white bryony Bryonia alba L. Cucurbitaceae Exotic
shepherd's-purse Capsella bursa-pastoris (L.) Medik. Brassicaceae Exotic
Carolina fanwort, fanwort Cabomba caroliniana A. Gray Cabombaceae Native
orbicular whitetop, lens-podded hoary cress Lepidium chalepense L. Brassicaceae Exotic
hoary cress Lepidium draba (L.) Desv Brassicaceae Exotic
woolly distaff thistle Carthamus lanatus L. Asteraceae Exotic
purple starthistle Centaurea calcitrapa L. Asteraceae Exotic
Iberian starthistle Centaurea iberica Trev. ex Spreng Asteraceae Exotic
brown knapweed Centaurea jacea L. Asteraceae Exotic
longspine sandbur Cenchrus longispinus (Hack.) Fern Poaceae Native
bighead knapweed Centaurea macrocephala Puschk. ex Willd. Asteraceae Exotic
black knapweed Centaurea nigra L. Asteraceae Exotic
alpine knapweed, Tyrol knapweed Centaurea nigrescens Willd Asteraceae Exotic
lambsquarters Chenopodium album L Chenopodiaceae Exotic
western waterhemlock Cicuta douglasii (DC.) Coult. & Rose Apiaceae Native
chicory Cichorium intybus L. Asteraceae Exotic
purple pampasgrass Cortaderia jubata (Lem.) Stapf Poaceae Exotic
narrowleaf hawksbeard Crepis tectorum L. Asteraceae Exotic
smallseed alfalfa dodder Cuscuta approximata Bab. Cuscutaceae Exotic
houndstongue Cynoglossum officinale L. Boraginaceae Exotic
purple nutsedge Cyperus rotundus L. Cyperaceae Exotic
striated broom Cytisus striatus (Hill) Rothm Fabaceae Exotic
Queen Anne's lace, wild carrot Daucus carota L. Apiaceae Exotic
spurgelaurel Daphne laureola L. Thymelaeaceae Exotic
cutleaf teasel Dipsacus laciniatus L. Dipsacaceae Exotic
barnyardgrass Echinochloa crus-galli (L.) Beauv Poaceae Exotic
common viper's bugloss, blueweed Echium vulgare L. Boraginaceae Exotic
quackgrass Elymus repens (L.) Gould Poaceae Exotic
hairy willowherb Epilobium hirsutum L. Onagraceae Exotic
field horsetail Equisetum arvense L Equisetaceae Native
giant horsetail Equisetum telmateia Ehrh. Equisetaceae Native
myrtle spurge Euphorbia myrsinites L Euphorbiaceae Exotic
eggleaf spurge Euphorbia oblongata Griseb Euphorbiaceae Exotic
Tartary buckwheat Fagopyrum tataricum (L.) Gaertn Polygonaceae Exotic
fennel Foeniculum vulgare P. Mill. Apiaceae Exotic
catchweed bedstraw Galium aparine L. Rubiaceae Native
French broom Genista monspessulana (L.) L. Johnson Fabaceae Exotic
babysbreath Gypsophila paniculata L. Caryophyllaceae Exotic
halogeton, saltlover Halogeton glomeratus (Bieb.) C.A. Mey. Chenopodiaceae Exotic
Texas blueweed Helianthus ciliaris DC. Asteraceae Native
common tarweed Centromadia pungens ssp. pungens (Hook. & Arn.) Greene Asteraceae Native
foxtail barley Hordeum jubatum L. Poaceae Native
black henbane Hyoscyamus niger L. Solanaceae Exotic
hairy cat's ear Hypochaeris radicata L. Asteraceae Exotic
pale yellow iris, yellow flag iris Iris pseudacorus L. Iridaceae Exotic
soft rush Juncus effusus L. Juncaceae Native
henbit Lamium amplexicaule L. Lamiaceae Exotic
lepyrodiclis Lepyrodiclis holosteoides (C.A. Mey.) Fenzl ex Fisch. & C.A. Mey. Caryophyllaceae Exotic
perennial pepperweed Lepidium latifolium L. Brassicaceae Exotic
oxeye daisy Leucanthemum vulgare Lam. Asteraceae Exotic
Dalmatian toadflax Linaria dalmatica (L.) P. Mill. Scrophulariaceae Exotic
creeping waterprimrose Ludwigia peploides (Kunth) Raven Onagraceae Native
European wand loosestrife Lythrum virgatum L. Lythraceae Exotic
garden loosestrife Lysimachia vulgaris L. Primulaceae Exotic
pineapple-weed Matricaria discoidea DC. Asteraceae Exotic
common mallow Malva neglecta Wallr. Malvaceae Exotic
wild four-o'clock Mirabilis nyctaginea (Michx.) MacM. Nyctaginaceae Native
matgrass Nardus stricta L. Poaceae Exotic
witchgrass Panicum capillare L. Poaceae Native
African rue Peganum harmala L. Zygophyllaceae Exotic
reed canarygrass Phalaris arundinacea L. Poaceae Exotic
hawkweed oxtongue Picris hieracioides L. Asteraceae Exotic
broadleaf plantain Plantago major L. Plantaginaceae Exotic
annual bluegrass Poa annua L. Poaceae Exotic
Canada bluegrass Poa compressa L. Poaceae Exotic
wild buckwheat Fallopia convolvulus L. Polygonaceae Exotic
curly leaf pondweed Potamogeton crispus L. Potamogetonaceae Exotic
ladysthumb Persicaria maculosa S.F. Gray Polygonaceae Exotic
cultivated knotweed Persicaria wallichii Greuter & Burdet Polygonaceae Exotic
Kentucky bluegrass Poa pratensis L. Poaceae
Austrian fieldcress Rorippa austriaca (Crantz) Bess. Brassicaceae Exotic
yellow fieldcress Rorippa sylvestris (L.) Bess. Brassicaceae Exotic
red sorrel Rumex acetosella L. Polygonaceae Exotic
curly dock Rumex crispus L. Polygonaceae Exotic
Himalayan blackberry Rubus armeniacus Focke Rosaceae Exotic
grassy arrowhead Sagittaria graminea Michx. Alismataceae Native
common saltwort Salsola kali L. Chenopodiaceae Exotic
cereal rye Secale cereale L. Poaceae Exotic
green foxtail Setaria viridis (L.) Beauv. Poaceae Exotic
common groundsel Senecio vulgaris L. Asteraceae Exotic
wild mustard Sinapis arvensis L. Brassicaceae Exotic
white cockle Silene latifolia ssp. alba (Mill.) Greuter & Burdet Caryophyllaceae Exotic
nightflowering catchfly Silene noctiflora L. Caryophyllaceae Exotic
bladder campion Silene vulgaris (Moench) Garcke Caryophyllaceae Exotic
field sowthistle Sonchus arvensis ssp. arvensis L. Asteraceae Exotic
spiny sowthistle Sonchus asper (L.) Hill Asteraceae Exotic
annual sowthistle Sonchus oleraceus L. Asteraceae Exotic
buffalobur Solanum rostratum Dunal Solanaceae Native
lawn burweed Soliva sessilis Ruiz & Pavón Asteraceae Exotic
smooth cordgrass Spartina alterniflora Loisel. Poaceae Native
common cordgrass Spartina anglica C.E. Hubbard Poaceae Exotic
corn spurry Spergula arvensis L. Caryophyllaceae Exotic
denseflower cordgrass Spartina densiflora Brongn. Poaceae Exotic
Spanish broom Spartium junceum L. Fabaceae Exotic
saltmeadow cordgrass Spartina patens (Ait.) Muhl. Poaceae Native
swainsonpea Sphaerophysa salsula (Pallas) DC. Fabaceae Exotic
medusahead Taeniatherum caput-medusae (L.) Nevski Poaceae Exotic
saltcedar Tamarix ramosissima Ledeb. Tamaricaceae Exotic
common tansy Tanacetum vulgare L. Asteraceae Exotic
field pennycress Thlaspi arvense L. Brassicaceae Exotic
western salsify Tragopogon dubius Scop. Asteraceae Exotic
coltsfoot Tussilago farfara L. Asteraceae Exotic
spiny cocklebur Xanthium spinosum L. Asteraceae Exotic
Syrian beancaper Zygophyllum fabago L. Zygophyllaceae Exotic
butterflybush Buddleja davidii Franch. Scrophulariaceae Exotic
common hempnettle Galeopsis tetrahit L. Lamiaceae Exotic
herb-robert Geranium robertianum L. Geraniaceae Exotic
yellow devil hawkweed Hieracium x floribundum Wimmer & Grab. [caespitosum x lactucella] Asteraceae Exotic
kingdevil hawkweed Hieracium piloselloides Vill. Asteraceae Exotic
salvation jane Echium plantagineum L. Boraginaceae Exotic
meadow sage Salvia pratensis L. Lamiaceae Exotic
Europe sage Salvia sclarea L. Lamiaceae Exotic
spurge flax Thymelaea passerina (L.) Coss. & Germ. Thymelaeaceae Exotic
fragrant waterlily Nymphaea odorata Ait. Nymphaeaceae Native
marsh thistle Cirsium palustre (L.) Scop. Asteraceae Exotic
Himalayan balsam Impatiens glandulifera Royle Balsaminaceae Exotic
yellow floating heart Nymphoides peltata (S.G. Gmel.) Kuntze Menyanthaceae Exotic
bird vetch Vicia cracca L. Fabaceae Exotic
nightshade Solanum spp. L. Solanaceae
perennial false-brome Brachypodium sylvaticum (Huds.) Beauv. Poaceae Exotic
evergreen clematis Clematis vitalba L. Ranunculaceae Exotic
yellow archangel Lamium galeobdolon (L.) Crantz Lamiaceae Exotic
bluebuttons, field scabious Knautia arvensis (L.) Coult. Caprifoliaceae Exotic
water primrose Ludwigia grandiflora ssp. hexapetala (Hook. & Arn.) Nesom & Kartesz Onagraceae Exotic
smooth hawkweed Hieracium laevigatum Asteraceae Native
common hawkweed Hieracium lachenalii K.C. Gmel. Asteraceae Exotic
hawkweeds Hieracium spp. L. Asteraceae
Japanese knotweed Reynoutria japonica Sieb. & Zucc. Polygonaceae Exotic
kochia Bassia scoparia (L.) A.J. Scott Chenopodiaceae Exotic
giant knotweed Reynoutria sachalinensis F. Schmidt ex Maxim. Polygonaceae Exotic
rough mannagrass Glyceria maxima (Hartman) Holmb. Poaceae Exotic
low cudweed Gnaphalium uliginosum L. Asteraceae Exotic
cluster tarweed Madia glomerata Hook. Asteraceae
biddy-biddy Acaena novae-zelandiae Kirk Rosaceae Exotic
burdock Arctium Asteraceae Exotic
common chickweed Stellaria media (L.) Vill. Caryophyllaceae Exotic
false mayweed Tripleurospermum maritimum (L.) W.D.J. Koch Asteraceae
hairy pepperweed Lepidium virginicum var. pubescens (Greene) Thell. Brassicaceae Native
pepperweed Lepidium spp. Brassicaceae
polar hawkweed Hieracium atratum Fr. Asteraceae Exotic
spotted knapweed Centaurea stoebe L. Asteraceae Exotic
mayweed, scentless chamomile Tripleurospermum inodorum (L.) Sch. Bip. Asteraceae Exotic
Bohemian knotweed, Hybrid Japanese knotweed Reynoutria x bohemica Chrtek & Chrtková Polygonaceae Exotic
hairy whitetop Lepidium appelianum Al-Shehbaz Brassicaceae Exotic
tansy ragwort Jacobaea vulgaris Gaertn. Asteraceae Exotic
leafy spurge Euphorbia virgata Waldst. & Kit. Euphorbiaceae Exotic
dodder (nonnative) Cuscuta (non-native) L. Cuscutaceae Exotic
mouse-eared hawkweed Pilosella officinarum Vaillant Asteraceae