King County 2008 Noxious Weed List

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Common Name	Scientific Name
Class A Noxious Weeds, 2008 list (eradication required in state and King County)
bighead knapweed	Centaurea macrocephala
buffalobur	Solanum rostratum
clary sage	Salvia sclarea
common cordgrass	Spartina anglica
common crupina	Crupina vulgaris
dense flower cordgrass	Spartina densiflora
dyers woad	Isatis tinctoria
eggleaf spurge	Euphorbia oblongata
European hawkweed	Hieracium sabaudum
floating primrose-willow	Ludwigia peploides
garlic mustard	Alliaria petiolata
giant hogweed	Heracleum mantegazzianum
goatsrue	Galega officinalis
hydrilla	Hydrilla verticillata
Italian thistle	Carduus pycnocephalus
johnsongrass	Sorghum halepense
kudzu	Pueraria montana var. lobata
meadow clary	Salvia pratensis
Mediterranean sage	Salvia aethiopis
milk thistle	Silybum marianum
purple starthistle	Centaurea calcitrapa
reed sweetgrass	Glyceria maxima
ricefield bulrush	Schoenoplectus mucronatus
salt meadow cordgrass	Spartina patens
silverleaf nightshade	Solanum elaeagnifolium
slenderflower thistle	Carduus tenuiflorus
Spanish broom	Spartium junceum
spurge flax	Thymelaea passerina
Syrian bean-caper	Zygophyllum fabago
Texas blueweed	Helianthus ciliaris
variable-leaf milfoil	Myriophyllum heterophyllum
velvetleaf	Abutilon theophrasti
Vochin knapweed	Centaurea nigrescens
yellow devil hawkweed	Hieracium floribundum

Class B Weeds 2008 list (control required in King County)
Common Name	Scientific Name
annual bugloss	Anchusa arvensis
Austrian fieldcress	Rorippa austriaca
black knapweed	Centaurea nigra
blackgrass	Alopecurus myosuroides
blueweed, viper's bugloss	Echium vulgare
Brazilian elodea	Egeria densa
brown knapweed	Centaurea jacea
camelthorn	Alhagi maurorum
common bugloss	Anchusa officinalis
common reed (non-native genotypes)	Phragmites australis
Dalmatian toadflax	Linaria dalmatica ssp. dalmatica
diffuse knapweed	Centaurea diffusa
fanwort	Cabomba caroliniana
garden loosestrife	Lysimachia vulgaris
gorse	Ulex europaeus
grass-leaved arrowhead	Sagittaria graminea
hoary alyssum	Berteroa incana
kochia	Kochia scoparia
leafy spurge	Euphorbia esula
lepyrodiclis	Lepyrodiclis holosteoides
longspine sandbur	Cenchrus longispinus
meadow knapweed	Centaurea jacea x nigra
mouseear hawkweed	Hieracium pilosella
musk thistle	Carduus nutans
orange hawkweed	Hieracium aurantiacum
oxtongue hawkweed	Picris hieracioides
parrotfeather	Myriophyllum aquaticum
perennial pepperweed	Lepidium latifolium
perennial sowthistle	Sonchus arvensis
plumeless thistle	Carduus acanthoides
polar hawkweed	Hieracium atratum
policeman's helmet	Impatiens glandulifera
purple loosestrife	Lythrum salicaria
queen-devil hawkweed	Hieracium glomeratum
rush skeletonweed	Chondrilla juncea
Russian knapweed	Acroptilon repens
saltcedar	Tamarix ramosissima Tamarix ramosissima
Scotch thistle	Onopordum acanthium
smooth cordgrass	Spartina alterniflora
smooth hawkweed	Hieracium laevigatum
spotted knapweed	Centaurea biebersteinii
sulfur cinquefoil	Potentilla recta
swainsonpea	Sphaerophysa salsula
tansy ragwort	Senecio jacobaea
water primrose	Ludwigia hexapetala
white bryony	Bryonia alba
wild chervil	Anthriscus sylvestris
yellow floating heart	Nymphoides peltata
yellow hawkweed	Hieracium caespitosum
yellow nutsedge	Cyperus esculentus
yellow starthistle	Centaurea solstitialis

Class C Noxious Weeds 2008 list (control required in King County)
Common Name	Scientific Name
common hawkweed	Hieracium lachenalii
hairy willowherb	Epilobium hirsutum
non-native and invasive hawkweeds	Hieracium spp.

Non-designated Noxious Weeds 2008 list (non-designate B and C weeds, control recommended but not required in King County)
Common Name	Scientific Name
absinth wormwood	Artemisia absinthium
Atlantic ivy	Hedera hibernica
Bohemian knotweed	Polygonum bohemicum
bull thistle	Cirsium vulgare Cirsium vulgare
butterfly bush	Buddleia davidii
Canada thistle	Cirsium arvense
common fennel (except bulbing variety azoricum)	Foeniculum vulgare
common groundsel	Senecio vulgaris
common St. Johnswort	Hypericum perforatum
common tansy	Tanacetum vulgare
curly-leaf pondweed	Potamogeton crispus
English ivy	Hedera helix Baltica
English ivy	Hedera helix Pittsburgh
English ivy	Hedera helix Star
Eurasian watermilfoil	Myriophyllum spicatum
field bindweed	Convolvulus arvensis
fragrant water lily	Nymphaea odorata
giant knotweed	Polygonum sachalinense
herb Robert	Geranium robertianum
Himalayan knotweed	Polygonum polystachyum
Japanese knotweed	Polygonum cuspidatum
lawnweed	Soliva sessilis
myrtle spurge	Euphorbia myrsinites
old man's beard	Clematis vitalba
oxeye daisy	Leucanthemum vulgare
poison-hemlock	Conium maculatum
reed canarygrass	Phalaris arundinacea
Scotch broom (required SR-2, I-90 E. of MP 34)	Cytisus scoparius
spurge laurel	Daphne laureola
wild carrot	Daucus carota
yellow archangel	Lamiastrum galeobdolon
yellow flag iris	Iris pseudacorus
yellow toadflax	Linaria vulgaris

Noxious Weeds of Concern 2008 list (unregulated weeds that nonetheless often impact and degrade native plant and animal habitat)
Common Name	Scientific Name
bittersweet nightshade	Solanum dulcamara
creeping buttercup	Ranunculus repens
English holly	Ilex aquifolium
English laurel	Prunus laurocerasus
evergreen blackberry	Rubus laciniatus
Hedge Bindweed	Calystegia sepium
Himalayan blackberry	Rubus armeniacus
tall buttercup	Ranunculus acris

Please direct questions & comments regarding noxious weeds to Program Staff, King County Noxious Weed Control Program.

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Water and Land Resources Web Site, please contact Fred Bentler, webmaster.

Department of Natural Resources and Parks
Water and Land Resources Division

Updated: Apr. 7, 2008

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