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2020 KING COUNTY NOXIOUS WEED LIST the King County Noxious Weed Control Board Has Adopted This Noxious Weed List in Accordance with RCW 17.10 and WAC 16-750

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2020 KING COUNTY NOXIOUS WEED LIST the King County Noxious Weed Control Board Has Adopted This Noxious Weed List in Accordance with RCW 17.10 and WAC 16-750 2020 KING COUNTY NOXIOUS WEED LIST The King County Noxious Weed Control Board has adopted this Noxious Weed List in accordance with RCW 17.10 and WAC 16-750. REGULATED CLASS A WEEDS: Highest priority REGULATED CLASS B WEEDS: Class B weeds are regulated in counties where they are limited in distribution or where they species due to potential impact and opportunity to prevent are a local priority. The following Class B weeds have been designated for control in King County by the State Weed Board or selected by spread. State law requires property owners to eradicate the King County Weed Board. Property owners in King County are required to control these species. these species. COMMON NAME SCIENTIFIC NAME COMMON NAME SCIENTIFIC NAME COMMON NAME SCIENTIFIC NAME 1, 6 6 common crupina 6 Crupina vulgaris blueweed; viper’s bugloss Echium vulgare saltcedar Tamarix ramosissima 3, 6 6 cordgrass, common 6 Spartina anglica Brazilian elodea Egeria densa shiny geranium Geranium lucidum cordgrass, dense flower 6 Spartina densiflora bugloss, annual Anchusa arvensis spurge, leafy 1, 6 Euphorbia virgata cordgrass, saltmeadow 6 Spartina patens bugloss, common 6 Anchusa officinalis starthistle, Malta Centaurea melitensis cordgrass, smooth 6 Spartina alterniflora camelthorn Alhagi maurorum starthistle, yellow 1 Centaurea solstitialis dyers woad 6 Isatis tinctoria common reed Phragmites australis sulfur cinquefoil Potentilla recta (non-native genotypes) eggleaf spurge 1, 6 Euphorbia oblongata tansy ragwort 1, 6 Jacobaea vulgaris Dalmatian toadflax 6 Linaria dalmatica ssp. false brome 6 Brachypodium sylvaticum thistle, musk 6 Carduus nutans dalmatica 6 floating primrose-willow 6 Ludwigia peploides thistle, plumeless Carduus acanthoides European coltsfoot Tussilago farfara 6 flowering-rush 6 Butomus umbellatus thistle, Scotch Onopordum acanthium 6 fanwort Cabomba caroliniana 6 French broom 1, 6 Genista monspessulana velvetleaf Abutilon theophrasti 6 gorse Ulex europaeus 6 garlic mustard 6 Alliaria petiolata water primrose Ludwigia hexapetala grass-leaved arrowhead 6 Sagittaria graminea giant hogweed 1, 6 Heracleum mantegazzianum white bryony 1 Bryonia alba 6 hairy willowherb Epilobium hirsutum 1, 6 goatsrue 1, 6 Galega officinalis wild chervil Anthriscus sylvestris hawkweeds; All non-native Hieracium, subgenus 6 yellow floatingheart 6 Nymphoides peltata hydrilla Hydrilla verticillata species and hybrids of the Pilosella Johnsongrass 1, 6 Sorghum halepense meadow subgenus 5, 6 yellow nutsedge Cyperus esculentus knapweed, bighead 6 Centaurea macrocephala 5, 6 hawkweed, European Hieracium sabaudum 6 knapweed, Vochin Centaurea nigrescens hawkweed, orange 6 Hieracium aurantiacum REGULATED CLASS C WEEDS: Class C weeds are generally widespread, but may be selected kudzu 6 Pueraria montana var. lobata hawkweed oxtongue Picris hieracioides on a local level. The following Class C weeds have been 6 meadow clary Salvia pratensis hoary alyssum Berteroa incana selected by the King County Weed Board based on potential oriental clematis 6 Clematis orientalis 1 threats and feasibility of control. Property owners in King houndstongue Cynoglossum officinale 1, 6 County are required to control these species. purple starthistle Centaurea calcitrapa indigobush 6 Amorpha fruticosa reed sweetgrass 6 Glyceria maxima 6 knapweed, black Centaurea nigra COMMON NAME SCIENTIFIC NAME ricefield bulrush 6 Schoenoplectus mucronatus 6 1 knapweed, brown Centaurea jacea absinth wormwood Artemesia absinthium sage, clary 6 Salvia sclarea 6 6 knapweed, diffuse Centaurea diffusa buffalobur Solanum rostratum sage, Mediterranean 6 Salvia aethiopis 6 knapweed, meadow Centaurea x moncktonii 1, 6 silverleaf nightshade Solanum elaeagnifolium knapweed, Russian 1 Rhaponticum repens LEGEND Known to occur in King County small-flowered jewelweed Impatiens parviflora knapweed, spotted 6 Centaurea stoebe Historically present, but thought to be eradicated South American spongeplant Limnobium laevigatum kochia 6 Bassia scoparia CONTROL REQUIRED Spanish broom 1, 6 Spartium junceum 6 loosestrife, garden Lysimachia vulgaris Syrian beancaper 6 Zygophyllum fabago 6 loosestrife, purple Lythrum salicaria Texas blueweed 6 Helianthus ciliaris 6 parrotfeather Myriophyllum aquaticum thistle, Italian 6 Carduus pycnocephalus 6 perennial pepperweed Lepidium latifolium 1, 6 thistle, milk Silybum marianum poison-hemlock 7 Conium maculatum thistle, slenderflower 6 Carduus tenuiflorus 6 policeman’s helmet Impatiens glandulifera Control noxious weeds to protect people, livestock, variable-leaf milfoil 6 Myriophyllum heterophyllum rush skeletonweed Chondrilla juncea crops and the environment. wild four o’clock 6 Mirabilis nyctaginea NON-REGULATED NOXIOUS WEEDS: The following Class B and C weeds from the state noxious weed list also impact the County. Property owners in King County are not required to control these species, except where noted, but control is FOOTNOTES: recommended where feasible. 1 Reported to be toxic to livestock and/or humans. Sources: USDA Poisonous Plant Research Laboratory, USDA Natural COMMON NAME SCIENTIFIC NAME CLASS COMMON NAME SCIENTIFIC NAME CLASS Resources Conservation Service, WA State Weed Board. blackberry, evergreen Rubus laciniatus C reed canarygrass Phalaris arundinacea B This list is for general information only and may not be all-inclusive. Contact a medical professional for information blackberry, Himalayan Rubus armeniacus C Scotch broom 1, 2, 6 Cytisus scoparius B about symptoms and treatment. butterfly bush6 Buddleja davidii B spiny cocklebur 1 Xanthium spinosum C 2 Control of Scotch broom is required on the right-of-way of common barberry Berberis vulgaris C spotted jewelweed Impatiens capensis C King County’s section of SR-2 and on the I-90 right-of-way 1 common catsear Hypochaeris radicata C spurge laurel Daphne laureola B between mile marker 34 and the King/Kittitas County line. common fennel Foeniculum vulgare B thistle, bull Cirsium vulgare C 3 Brazilian elodea is designated for control throughout King (except var. azoricum) thistle, Canada Cirsium arvense C County except in Lake Washington, Lake Sammamish, Lake common groundsel 1 Senecio vulgaris C 1 tree-of-heaven Ailanthus altissima C Union, Lake Fenwick, Lake Doloff and the Sammamish River. common St. Johnswort Hypericum perforatum C 4 ventenata Ventenata dubia C Control of Bohemian, Japanese, giant and Himalayan common tansy 1 Tanacetum vulgare C Polygonum xbohemicum, P. cuspidatum, P. watermilfoil, Eurasian 6 Myriophyllum spicatum B knotweed ( sachalinense, P. polystachyum) is required on the Green common teasel Dipsacus fullonum C 6 watermilfoil hybrid , Myriophyllum spicatum x C River and its tributaries above the Auburn City Limits and curlyleaf pondweed Potamogeton crispus C (Eurasian x northern) M. sibiricum on the Cedar River and its tributaries above the Renton field bindweed Convolvulus arvensis C 6 wild carrot Daucus carota C City Limits (tributaries included are those defined as Type fragrant waterlily Nymphaea odorata C yellow archangel 6 Lamiastrum galeobdolon B S, F or N aquatic areas in KCC 21A.24.355). Control of these invasive knotweed species is required up to the hairy whitetop 1 Lepidium appelianum C yellowflag iris 1 Iris pseudacorus C ordinary high water mark (or to the top of the bank if the hawkweeds; All non- Hieracium, subgenus B yellow toadflax Linaria vulgaris C ordinary high water mark cannot be identified) and in the native species and Hieracium adjacent buffer area as specified in KCC 21A.24.358. This hybrids of the wall WEEDS OF CONCERN: requirement to control knotweed is contingent upon the 5, 6 subgenus The King County Weed Board encourages control of these noxious weed program or program partners providing hawthorn, English Crataegus monogyna C non-native, invasive plants, and discourages new plantings. knotweed control services in the selected area for affected King County’s Critical Areas Ordinance cites this list, formerly herb-Robert Geranium robertianum B private land landowners who request assistance. called the Obnoxious Weed List, as invasive vegetation that 5 hoary cress 1 Lepidium draba C threatens native ecosystems by displacing beneficial vegetation Non-native yellow-flowered hawkweeds (Hieracium species) Italian arum Arum italicum C and degrading wildlife and native plant habitat. Property are consolidated into two listings by subgenus: meadow owners are not required to control these species and they are (Pilosella) and wall (Hieracium). Control of species in the ivy, English (four Hedera helix ‘Baltica’ C not state-listed noxious weeds. Education is being provided as meadow group is required in King County. Control of cultivars only: ‘Baltica’, Hedera helix ‘Pittsburgh’ authorized by RCW 17.10.090. species in the wall group is not required in King County ‘Pittsburgh’,‘Star’, Hedera helix ‘Star’ with the exception of European hawkweed (Hieracium 1 and ‘Hibernica’) Hedera hibernica ‘Hibernica’ sabaudum COMMON NAME SCIENTIFIC NAME ). jubata grass Cortaderia jubata C bird cherry Prunus avium 6 Quarantine species. It is prohibited to transport, buy, sell, 4, 6 knotweed, Bohemian Polygonum x bohemicum B bird’s-foot trefoil 1 Lotus corniculatus offer for sale, or distribute plants, plant parts or seeds of knotweed, giant 4, 6 Polygonum sachalinese B this species within the state of Washington. Noxious Weed bishop’s weed Aegopodium podagraria 4, 6 Seed and Plant Quarantine, WAC 16-752-600. Contact knotweed, Himalayan Persicaria wallichii B bittersweet nightshade 1 Solanum dulcamara
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