To the best of my knowledge these names are reasonably accurate. If you see a plant misnamed or any errors on these pages, please email me at webmistress AT sunnibergeron DOT com.

My flower photography is not copyrighted. You may glean them and use them as you please.

= Poisonous to animal and/or human
= Crop weed in Washington
= Native to Washington
= Noxious or invasive in Washington
= Endangered in Washington
= Federal noxious weed in Washington
= Quarantine! Mandatory immediate destruction

Washington State Weed Lists

The information aon this page was gleaned directly from the Washington State Noxious Weed Control Board 2008 list.

Class A Weeds: Non-native species whose distribution in Washington is still limited. Preventing new infestations and eradicating existing infestations are the highest priority. Eradication of all Class A plants is required by law.

Common Name First
Scientific Name First

Clary sage - Salvia sclarea
Cordgrass, common - Spartina anglica
Common crupina - Crupina vulgaris
Cordgrass, dense flower - Spartina densiflora
Cordgrass, salt meadow - Spartina patens
Cordgrass, smooth - Spartina alterniflora
Dyers woad - Isatis tinctoria
Eggleaf spurge - Euphorbia oblongata
False brome - Brachypodium sylvaticum
Floating primrose-willow - Ludwigia peploides
Flowering rush - Butomis umbellatis
French broom - Genista monspessulana
Garlic mustard - Alliaria petiolata
Giant hogweed - Heracleum mantegazzianum
Goatsrue - Galega officinalis
Hydrilla - Hydrilla verticillata
Johnsongrass - Sorghum halepense
Knapweed, bighead - Centaurea macrocephala
Knapweed, Vochin - Centaurea nigrescens
Kudzu - Pueraria montana var. lobata
Milk thistle - Silybum marianum
Oriental clematis - Clematis orientalis
Perennial false-brome - Brachypodium sylvaticum
Purple starthistle - Centaurea calcitrapa
Ravenna grass - Saccharum ravennae
Reed sweetgrass - Glyceria maxima
Ricefield bulrush - Schoenoplectus mucronatus
Sage, Meadow clary - Salvia pratensis
Sage, Mediterranean - Salvia aethiopis
Salt meadow cordgrass - Spartina patens
Shiny geranium - Geranium lucidum
Silverleaf nightshade - Solanum elaeagnifolium
Spanish broom - Spartium junceum
Spurge flax - Thymelaea passerina
Syrian bean-caper - Zygophyllum fabago
Texas blueweed - Helianthus ciliaris
Thistle, Italian - Carduus pycnocephalus
Thistle, milk - Silybum marianum
Thistle, slenderflower - Carduus Tenuiflorus
Variable-leaf milfoil - Myriophyllum heterophyllum
Velvetleaf - Abutilon theophrasti
Wild four o'clock - Mirabilis nyctaginea

Abutilon theophrasti - velvetleaf
Alliaria petiolata - garlic mustard
Brachypodium sylvaticum - Perennial false-brome
Butomis umbellatis
- Flowering rush
Carduus pycnocephalus - thistle: Italian
Carduus tenuiflorus - slenderflower
Centaurea calcitrapa - purple starthistle
Centaurea macrocephala - knapweed: bighead
Centaurea nigrescens - knapweed: Vochin
Clematis orientalis - Oriental clematis
Crupina vulgaris - common crupina
Euphorbia oblongata - eggleaf spurge
Galega officinalis - goatsrue
Genista monspessulana - French broom
Geranium lucidum - Shiny geranium
Glyceria maxima - reed sweetgrass
Helianthus ciliaris - Texas blueweed
Heracleum mantegazzianum - giant hogweedhawkweed
Hydrilla verticillata - hydrilla
Isatis tinctoria - dyers woad
Ludwigia peploides - floating primrose-willow
Mirabilis nyctaginea - wild four o'clock
Myriophyllum heterophyllum - variable-leaf milfoil
Pueraria montana var. lobata - kudzu
Saccharum ravennae - Ravenna grass
Salvia aethiopis - sage: Mediterranean
Salvia pratensis - meadow clary
Salvia sclarea - sage: clary sage
Schoenoplectus mucronatus - ricefield bulrush
Silybum marianum - milk thistle
Solanum elaeagnifolium - silverleaf
Sorghum halepense - johnsongrass
Spartina alterniflora - Cordgrass, smooth>
Spartina anglica - Cordgrass, common
Spartina densiflora - cordgrass: dense flower
Spartina patens - Salt meadow cordgrass
Spartium junceum - Spanish broom
Thymelaea passerina - spurge flax
Zygophyllum fabago - Syrian bean-caper

Class B Weeds: Non-native species presently limited to portions of the State. Species are designated for control in regions where they are not yet widespread. Preventing new infestations in these areas is a high priority. In regions where a Class B species is already abundant, control is decided at the local level, with containment as the primary goal. Please contact your County Noxious Weed Control Coordinator to learn which species are designated in your area.

Common Name First
Scientific Name First

Austrian fieldcress - Rorippa austriaca
Blackgrass - Alopecurus myosuroides
Blueweed - Echium vulgare
Brazilian elodea - Egeria densa
Bugloss, annual - Anchusa arvensis
Bugloss, common - Anchusa officinalis
Burning-bush - Bassia scoparia (Kochia scoparia)
butterfly bush - Buddleja davidii
Camelthorn - Alhagi maurorum
Common fennel - Foeniculum vulgare
Common reed - Phragmites australis
Cordgrass, smooth - Spartina alterniflora
Dalmatian toadflax - Linaria Dalmatica ssp. dalmatica
Eurasian watermilfoil - Myriophyllum spicatum
Fanwort - Cabomba caroliniana
Fireball - Bassia scoparia (Kochia scoparia)
Gorse - Ulex europaeus
Grass-leaved arrowhead - Sagittaria graminea
Hairy willow-herb - Epilobium hirsutum
Hawkweed, oxtongue - Picris hieracioides
Hawkweed, mouseear - Hieracium pilosella
Hawkweed, orange - Hieracium aurantiacum
Hawkweed, polar - Hieracium atratum
Hawkweed, queen-devil - Hieracium glomeratum
Hawkweed, smooth - Hieracium laevigatum
Hawkweed, yellow - Hieracium caespitosum
Herb-Robert - Geranium robertianum
Hoary alyssum - Berteroa incana
Houndstongue - Cynoglossum officinale
Indigobush - Amorpha fruticosa
Knapweed, black - Centaurea nigra
Knapweed, brown - Centaurea jacea
Knapweed, diffuse - Centaurea diffusa
Knapweed, meadow - Centaurea jacea x nigra
Knapweed, Russian - Acroptilon repens
Knapweed: spotted - Centaurea stoebe, c. biebersteinii
Knotweed: Bohemian - Polygonum bohemicum
Knotweed: giant - Polygonum sachalinense
Knotweed: Himalayan - Polygonum polystachyum
Knotweed: Japanese - Polygonum cuspidatum
Kochia - Bassia scoparia (Kochia scoparia)
Lesser celandine - Ficaria verna
Longspine sandbur - Cenchrus Longispinus
Loosestrife, garden - Lysimachia vulgaris
Loosestrife, purple - Lythrum salicaria
Loosestrife, wand - Lythrum virgatum
Mexican fireweed - Bassia scoparia (Kochia scoparia)
Parrotfeather - Myriophyllum aquaticum
Perennial pepperweed - Lepidium latifolium
Poison hemlock - Conium maculatum
Policeman's helmet - Impatiens glandulifera
Puncturevine - Tribulus terrestris
Rush skeletonweed - Chondrilla juncea
Saltcedar - Tamarix ramosissima
Scotch broom - Cytisus scoparius
Shiny geranium - Geranium lucidum
Spurge: laurel - Daphne laureola
Spurge: leafy - Euphorbia esula
Spurge: myrtle - Euphorbia myrsinites
summer-cyprus - Bassia scoparia (Kochia scoparia)
Sulfur cinquefoil - Potentilla recta
Tansy ragwort - Jacobaea vulgaris Gaertn. syn Senecio jacobaea
Thistle, musk - Carduus nutans
Thistle, plumeless - Carduus acanthoides
Thistle, Scotch - Onopordum acanthium
Velvetleaf - Abutilon theophrasti
Water primrose - Ludwigia hexapetala
White bryony - Bryonia alba
Wild chervil - Anthriscus sylvestris
Yellow archangel - Lamiastrum galeobdolon
Yellow floating heart - Nymphoides peltata
Yellow nutsedge - Cyperus esculentus
Yellow starthistle - Centaurea solstitialis

Abutilon theophrasti - Velvetleaf
Acroptilon repens
- knapweed: Russian
Alhagi maurorum - camelthorn
Alopecurus myosuroides - blackgrass
Amorpha fruticosa - indigobush
Anchusa arvensis - bugloss: annual
Anchusa officinalis - bugloss: common
Anthriscus sylvestris - wild chervil
Bassia scoparia (Kochia scoparia) - kochia, summer-cyprus, burning-bush, fireball, Mexican fireweed
Berteroa incana - hoary alyssum
Bryonia alba - white bryony
Buddleja davidii - butterfly bush
Cabomba caroliniana - fanwort
Carduus acanthoides - thistle: plumeless
Carduus nutans - thistle: musk
Cenchrus longispinus - longspine sandbur
Centaurea diffusa - knapweed: diffuse
Centaurea jacea - knapweed: brown
Centaurea jacea x nigra - knapweed: meadow
Centaurea nigra - knapweed: black
Centaurea solstitialis - yellow starthistle
Centaurea stoebe, c. biebersteinii - knapweed: spotted
Chondrilla juncea - rush skeletonweed
Conium maculatum - Poison hemlock
Cynoglossum officinale
- houndstongue
Cyperus esculentus - yellow nutsedge
Cytisus scoparius - Scotch broom
Daphne laureola - spurge laurel
Echium vulgare - blueweed
Egeria densa - Brazilian elodea
Epilobium hirsutum - Hairy willow-herb
Euphorbia esula - spurge: leafy
Euphorbia myrsinites - spurge: myrtle
Ficaria verna - Lesser celandine
Foeniculum vulgare - common fennel
Geranium lucidum - Shiny geranium
Geranium robertianum - herb-Robert
Hieracium atratum - hawkweed: polar
Hieracium aurantiacum - hawkweed: orange
Hieracium caespitosum - hawkweed: yellow
Hieracium glomeratum - hawkweed: queen-devil
Hieracium laevigatum - hawkweed: smooth
Hieracium pilosella - hawkweed: mouseear
Impatiens glandulifera - policeman's helmet
Jacobaea vulgaris Gaertn. syn Senecio jacobaea - tansy ragwort
Kochia scoparia (Bassia scoparia) - kochia, summer-cyprus, burning-bush, fireball, Mexican fireweed
Lamiastrum galeobdolon - Yellow archangel
Lepidium latifolium
- perennial pepperweed
Linaria dalmatica ssp. dalmatica - Dalmatian toadflax
Ludwigia hexapetala - water primrose
Lysimachia vulgaris - loosestrife: garden
Lythrum salicaria - loosestrife: purple
Lythrum virgatum - loosestrife: wand
Myriophyllum aquaticum - parrotfeather
Myriophyllum spicatum - Eurasian watermilfoil
Nymphoides peltata - yellow floating heart
Onopordum acanthium - thistle: Scotch
Phragmites australis - Common reed
Picris hieracioides - hawkweed oxtongue
Polygonum bohemicum - knotweed: Bohemian
Polygonum cuspidatum - knotweed: Japanese
Polygonum polystachyum - knotweed: Himalayan
Polygonum sachalinense - knotweed: giant
Potentilla recta - sulfur cinquefoil
Rorippa austriaca - Austrian fieldcress
Sagittaria graminea - grass-leaved arrowhead
Tamarix ramosissima - saltcedar
Tribulus terrestris - puncturevine
Ulex europaeus - gorse

Class C Weeds: Noxious weeds which are already widespread in Washington or are of special interest to the state's agricultural industry. The Class C status allows counties to enforce control if locally desired. Other counties may choose to provide education or technical consultation.

Common Name First
Scientific Name First

Absinth wormwood - Artemisia absinthium
Austrian fieldcress - Rorippa austriaca
Babysbreath - Gypsophila paniculata
Black henbane - Hyoscyamus niger
Blackgrass - Alopecurus myosuroides
Buffalobur - Solanum rostratum
Canada thistle - Cirsium arvense
Cattails (nonnative) - Typha species
Cereal rye - Secale cereale
Common barberry - Berberis vulgaris
Common catsear - Hypochaeris radicata
Common groundsel - Senecio vulgaris
Common St. Johnswort - Hypericum perforatum
Common tansy - Tanacetum vulgare
Common teasel - Dipsacus fullonum
Curly-leaf pondweed - Potamogeton crispus
English ivy - Hedera helix
Evergreen blackberry - Rubus laciniatus
Field bindweed - Convolvulus arvensis
Fragrant water lily - Nymphaea odorata
Hairy whitetop - Cardaria pubescens
Hawkweeds, nonnative listed elsewhere - Hieracium spp.
Himalyan blackberry - Rubus armeniacus
Hoary cress - Cardaria draba
Italian arum - Arum italicum
Japanese eelgrass - Zostera japonica
Jointed goatgrass - Aegilops cylindrica
Jubata grass - Cortaderia jubata
Lawn burweed - Soliva sessilis
Lepyrodiclis - Lepyrodiclis holosteoides
Longspine sandbur - Cenchrus longispinus
Old man's beard - Clematis vitalba
Oxeye daisy - Leucanthemum vulgare
Pampas grass - Cortaderia selloana
Perennial sowthistle - Sonchus arvensis ssp. arvensis
Reed: canarygrass - Phalaris arundinacea
Russian olive - Elaeagnus angustifolia
Scentless mayweed - Tripleurospermum perforatum (Matricaria perforata)
Smoothseed alfalfa dodder - Cuscata approximata
Spikeweed - Centromadia pungens ssp. pungens (Hemizonia pungens)
Spiny cocklebur - Xanthium spinosum
Swainsonpea - Sphaerophysa salsula
Tree-of-heaven - Ailanthus altissima
White cockle - Silene latifolia ssp. alba
Wild carrot - Daucus carota
Yellow flag iris - Iris pseudacorus
Yellow toadflax - Linaria vulgaris

Aegilops cylindrica - jointed goatgrass
Ailanthus altissima - Tree-of-heaven
Alopecurus myosuroides - Blackgrass
Artemisia absinthium
- absinth wormwood
Arum italicum - Italian arum
Berberis vulgaris - Common barberry
Cardaria draba - hoary cress
Cardaria pubescens - hairy whitetop
Cenchrus longispinus - Longspine sandbur
Centromadia pungens ssp. pungens (Hemizonia pungens) - Spikeweed
Cirsium arvense - Canada thistle
Clematis vitalba - old man's beard
Convolvulus arvensis - field bindweed
Cortaderia jubata - Jubata grass
Cortaderia selloana - Pampas grass
Cuscata approximata - smoothseed alfalfa dodder
Daucus carota - wild carrot, Queen Anne's lace
Dipsacus fullonum - Common teasel
Elaeagnus angustifolia - Russian olive
Gypsophila paniculata - babysbreath
Hedera helix - English ivy
Hemizonia pungens (Centromadia pungens ssp. pungens) - Spikeweed
Hieracium spp. - hawkweeds, nonnative not listed elsewhere
Hyoscyamus niger - black henbane
Hypericum perforatum - common St. Johnswort
Hypochaeris radicata - common catsear
Iris pseudacorus - yellow flag iris
Lepyrodiclis holosteoides - lepyrodiclis
Leucanthemum vulgare - oxeye daisy
Linaria vulgaris - yellow toadflax
Matricaria perforata (Tripleurospermum perforatum) - Scentless mayweed
Nymphaea odorata - fragrant water lily
Phalaris arundinacea - reed canarygrass
Potamogeton crispus - curly-leaf pondweed
Rorippa austriaca - Austrian fieldcress
Rubus armeniacus - Himalyan blackberry
Rubus laciniatus
- Evergreen blackberry
Secale cereale
- cereal rye
Senecio vulgaris - common groundsel
Silene latifolia ssp. alba - white cockle
Solanum rostratum - Buffalobur
Soliva sessilus - Lawn burweed
Sonchus arvensis ssp. arvensis - perennial sowthistle
Sphaerophysa salsula - swainsonpea
Tanacetum vulgare - common tansy
Tripleurospermum perforatum (Matricaria perforata) - Scentless mayweed
Typha species - Cattails (nonnative)
Xanthium spinosum - spiny cocklebur
Zostera japonica - Japanese eelgrass

Noxious weed seed and plant QUARANTINE: The Washington State Department of Agriculture (WSDA) maintains and regulates a plant quarantine list, called Plants And Seeds Whose Sales are Prohibited in Washington State (Chapter 16-752-600 WAC) . This quarantine list consists of many ornamental plants, as escaped ornamentals are a significant source of noxious weed infestations

Common Name First
Scientific Name First

African elodea - Lagarosiphon major
Alkanet, Anchusa - Anchusa officinalis
Asian spiderwort - Murdannia keisak
Australian swamp stonecrop - Crassula helmsii
Bat nut - Trapa bicornis
Bladder ketmia - Hibiscus trionum
Black knapweed - Centaurea nigra
Blue devil, Blue thistle, Blueweed - Echium vulgare
Bohemian knotweed - Polygonum ×bohemicum [cuspidatum × sachalinense]
Brazilian elodea - Egeria densa
Brittle naiad - Najas minor
Brown centaury, Brown knapweed - Centaurea jacea
Buffalobur - Solanum rostratum
Bull nut - Trapa natans
Burning-bush - Bassia scoparia (Kochia scoparia)
Clary sage - Salvia sclarea
Common bugloss - Anchusa officinalis
Common cordgrass - Spartina anglica
Common crupina - Crupina vulgaris
Dalmatian toadflax - Linaria dalmatica ssp. dalmatica
Delta arrowhead - Sagittaria platyphylla
Dense-flowered cordgrass, Denseflower cordgrass - Spartina densiflora
Devil's paintbrush - Hieracium caespitosum
Devil's pod - Trapa bicornis
Devil's weed - Hieracium aurantiacum
Diffuse knapweed - Centaurea diffusa
Dwarf snapdragon - Chaenorhinum minus
Dyers' woad - Isatis tinctoria
Eggleaf spurge - Euphorbia oblongata
Eurasian watermilfoil - Myriophyllum spicatum
European frog-bit - Hydrocharis morsus-ranae
European hawkweed - Hieracium sabaudum
Fanwort - Cabomba caroliniana
Field hawkweed - Hieracium caespitosum
Fireball - Bassia scoparia (Kochia scoparia)
Flameweed - Hieracium aurantiacum
Floating primrose-willow - Ludwigia peploides
Flower-of-an-hour - Hibiscus trionum
Flowering rush - Butomus umbellatus
French broom - Genista monspessulana
Furze - Ulex europaeus
Garden loosestrife - Lysimachia vulgaris
Garlic mustard - Alliaria petiolata
Giant cow parsnip, Giant hogweed - Heracleum mantegazzianum
Giant knotweed - Polygonum sachalinense
Giant reed - Arundo donax (except variegated cultivars)
Goatsrue - Galega officinalis
Gorse - Ulex europaeus
Grass-leaved arrowhead - Sagittaria graminea
Grim-the-collier - Hieracium aurantiacum
Hairy willow herb - Epilobium hirsutum
Hardheads - Centaurea jacea
Hedgeparsley - Torilis arvensis
Himalayan knotweed - Polygonum polystachyum
Horse-knobs - Centaurea jacea
Hydrilla - Hydrilla verticillata
Indigobush - Amorpha fruticosa
Italian thistle - Carduus pycnocephalus
Japanese knotweed - Polygonum cuspidatum
Johnsongrass - Sorghum halepense
King devil - Hieracium caespitosum
Kochia - Bassia scoparia (Kochia scoparia)
Kudzu - Pueraria montana var. lobata
Lawn burweed - Soliva sessilis
Lead plant - Amorpha fruticosa
Leafy spurge - Euphorbia esula
Marsh dew flower - Murdannia keisak
Meadow clary - Salvia pratensis
Meadow knapweed - Centaurea jacea x nigra
Mediterranean sage - Salvia aethiopis
Mexican fireweed - Bassia scoparia (Kochia scoparia)
Milk thistle - Silybum marianum
Modesty - Hibiscus trionum
Mouseear hawkweed - Hieracium pilosella
Mud mat - Glossostigma diandrum
Musk thistle - Carduus nutans
Nodding thistle - Carduus nutans
Orange hawkweed, Orange paintbrush - Hieracium aurantiacum
Oriental clematis - Clematis orientalis
Oxeye daisy - Leucanthemum vulgare
Parrotfeather - Myriophyllum aquaticum
Perennial false-brome - Brachypodium sylvaticum
Perennial pepperweed - Lepidium latifolium
Plumeless thistle - Carduus acanthoides
Policeman's helmet - Impatiens glandulifera
Purple loosestrife (Including ALL hybrids and cultivars) - Lythrum salicaria
Purple starthistle - Centaurea calcitrapa
Queen Anne's lace - Daucus carota
Rayed knapweed - Centaurea jacea
Red daisy - Hieracium aurantiacum
Reed sweetgrass - Glyceria maxima
Ricefield bulrush -Schoenoplectus mucronatus
Salt meadow cordgrass - Spartina patens
Saltcedar - Tamarix ramosissima
Scotch broom - Cytisus scoparius
Scotch thistle - Onopordum acanthium
Shiny geranium - Geranium lucidum
Shoo-fly - Hibiscus trionum
Silverleaf nightshade - Solanum elaeagnifolium
Slenderflower thistle - Carduus tenuiflorus
Slender-leaved naiad - Najas minor
Smooth cordgrass - Spartina alterniflora
Snake flower - Echium vulgare
Spanish broom - Spartium junceum
Spotted knapweed - Centaurea stoebe ssp. micranthos (Centaurea biebersteinii)
Spurge flax - Thymelaea passerina
Summer-cyprus - Bassia scoparia (Kochia scoparia)
Swollen bladderwort - Utricularia inflata
Syrian bean-caper, Syrian beancaper - Zygophyllum fabago
Tall manna grass - Glyceria maxima
Tansy ragwort - Senecio jacobaea
Texas blueweed - Helianthus ciliaris
Umbrella-wort - Mirabilis nyctaginea
Unicorn-plant - Proboscidea louisianica
Variable-leaf watermilfoil - Myriophyllum heterophyllum
Velvetleaf - Abutilon theophrasti
Venice mallow - Hibiscus trionum
Viper's bugloss - Echium vulgare
Vochin knapweed - Centaurea nigrescens
Wand loosestrife (Including ALL hybrids and cultivars) - Lythrum virgatum
Water caltrap - Trapa bicornis
Water chestnut - Trapa natans
Water primrose - Ludwigia grandiflora ssp. hexapetala (Ludwigia hexapetala)
Water soldier - Stratiotes aloides
Wild carrot - Daucus carota
Wild chervil - Anthriscus sylvestris
Wild four o'clock - Mirabilis nyctaginea
Yellow devil, Yellow hawkweed, Yellow paintbrush - Hieracium caespitosum
Yellow floating heart - Nymphoides peltata
Yellow devil hawkweed - Hieracium ×floribundum [caespitosum × lactucella]

Abutilon theophrasti - Velvetleaf
Alliaria petiolata - Garlic mustard
Amorpha fruticosa - Indigobush, Lead plant
Anchusa officinalis - Common bugloss, Alkanet, Anchusa
Anthriscus sylvestris - Wild chervil
Arundo donax (except variegated cultivars) - Giant reed
Bassia scoparia (Kochia scoparia) - Burning-bush, Fireball, Kochia, Mexican fireweed, Summer-cyprus
Brachypodium sylvaticum - Perennial false-brome
Butomus umbellatus - Flowering rush
Cabomba caroliniana - Fanwort
Carduus acanthoides - Plumeless thistle
Carduus nutans - Musk thistle, Nodding thistle
Carduus pycnocephalus - Italian thistle
Carduus tenuiflorus - Slenderflower thistle
Centaurea calcitrapa - Purple starthistle
Centaurea diffusa - Diffuse knapweed
Centaurea jacea - Brown centaury, Brown knapweed, Hardheads, Horse-knobs, Rayed knapweed
Centaurea jacea x nigra - knapweed: meadow
Centaurea nigra - Black knapweed
Centaurea nigrescens - Vochin knapweed
Centaurea stoebe ssp. micranthos (Centaurea biebersteinii) - Spotted knapweed
Chaenorhinum minus - Dwarf snapdragon
Clematis orientalis - Oriental clematis
Crassula helmsii - Australian swamp stonecrop
Crupina vulgaris - Common crupina
Cyperus rotundus - Purple nutsedge
Cytisus scoparius - Scotch broom
Daucus carota - Wild carrot, Queen Anne's lace
Echium vulgare - Blueweed, Blue thistle, Blue devil, Viper's bugloss, Snake flower
Egeria densa - Brazilian elodea
Epilobium hirsutum - Hairy willow herb
Euphorbia esula - Leafy spurge
Euphorbia oblongata - Eggleaf spurge
Galega officinalis - Goatsrue
Genista monspessulana - French broom
Geranium lucidum - Shiny geranium
Glossostigma diandrum
- Mud mat
Glyceria maxima
- Reed sweetgrass, Tall manna grass
Helianthus ciliaris
- Texas blueweed
Heracleum mantegazzianum - Giant hogweed, Giant cow parsnip
Hibiscus trionum - Bladder ketmia, Flower-of-an-hour, Modesty, Shoo-fly, Venice mallow
Hieracium aurantiacum - Devil's weed, Flameweed, Grim-the-collier, Orange hawkweed, Orange paintbrush, Red daisy
Hieracium caespitosum - Devil's paintbrush, Field hawkweed, King devil, Yellow hawkweed, Yellow paintbrush, Yellow devil
Hieracium floribundum - Yellow devil hawkweed
Hieracium pilosella - Mouseear hawkweed
Hieracium sabaudum - European hawkweed
Hydrilla verticillata
- Hydrilla
Hydrocharis morsus-ranae - European frog-bit
Impatiens glandulifera - Policeman's helmet
Isatis tinctoria - Dyers' woad
Kochia scoparia (Bassia scoparia) - kochia, summer-cyprus, burning-bush, fireball, Mexican fireweed
Lagarosiphon major - African elodea
Lepidium latifolium - Perennial pepperweed
Leucanthemum vulgare - oxeye daisy
Linaria dalmatica ssp. dalmatica - Dalmatian toadflax
Ludwigia grandiflora ssp. hexapetala (Ludwigia hexapetala) - Water primrose
Ludwigia peploides - floating primrose-willow
Lysimachia vulgaris
- garden loosestrife
Lythrum salicaria - Purple loosestrife (Including ALL hybrids and cultivars)
Lythrum virgatum
- Wand loosestrife (Including ALL hybrids and cultivars)
Mirabilis nyctaginea
- Wild four o'clock, Umbrella-wort
Murdannia keisak
- Marsh dew flower, Asian spiderwort
Myriophyllum aquaticum - Parrotfeather
Myriophyllum heterophyllum - Variable-leaf watermilfoil
Myriophyllum spicatum - Eurasian watermilfoil
Najas minor - Slender-leaved naiad, Brittle naiad
Nymphoides peltata - Yellow floating heart
Onopordum acanthium - Scotch thistle
Polygonum cuspidatum - Japanese knotweed
Polygonum polystachyum - Himalayan knotweed
Polygonum sachalinense - Giant knotweed
Polygonum ×bohemicum [cuspidatum × sachalinense] - Bohemian knotweed
Proboscidea louisianica - Unicorn-plant
Pueraria montana var. lobata - Kudzu
Sagittaria graminea - Grass-leaved arrowhead
Sagittaria platyphylla - Delta arrowhead
Salvia aethiopis - Mediterranean sage
Salvia pratensis - Meadow clary
Salvia sclarea
- clary sage
Schoenoplectus mucronatus - Ricefield bulrush
Senecio jacobaea - Tansy ragwort
Silybum marianum - Milk thistle
Solanum elaeagnifolium - Silverleaf nightshade
Solanum rostratum - Buffalobur
Soliva sessilus - Lawn burweed
Sorghum halepense - Johnsongrass
Spartina alterniflora - Smooth cordgrass
Spartina anglica - Common cordgrass
Spartina densiflora - Dense-flowered cordgrass, Denseflower cordgrass
Spartina patens - Salt meadow cordgrass
Spartium junceum - Spanish broom
Stratiotes aloides - Water soldier
Tamarix ramosissima - Saltcedar
Thymelaea passerina - Spurge flax
Torilis arvensis - Hedgeparsley
Trapa bicornis
- Bat nut, Devil's pod,Water caltrap
Trapa natans - Bull nut, Water chestnut
Ulex europaeus - Gorse, Furze
Utricularia inflata - Swollen bladderwort
Zygophyllum fabago - Syrian bean-caper, Syrian beancaper

 

 

 

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Scientific Names: A-F
Scientific Names: G-M
Scientific Names: N-S
Scientific Names: T-Z
Common Names: A-F
Common Names: G-M
Common Names: N-S
Common Names: T-Z
Mystery flowers. Can you help me name them?
01 - 02 - 03
Island Wildlife
01 - 02 - 03
- 04 - 05
Washington Natives: A-F
Washington Natives: G-M
Washington Natives: N-R
Washington Natives: S-Z
(Alphabetized by scientific name)

Noxious Flowers , Washington

Endangered Flowers, Washington

Poisonous Plants

Plant Identification Sources (*.pdf file)

USDA Hungry Pests Sharing information about the threat invasive plant pests, diseases and harmful weeds pose to America's fruits, vegetables, trees, and other plants—and how the public can help prevent their spread.

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Last revised: July 5 2016