THE 2009 PIERCE COUNTY NOXIOUS WEED LIST
CLASS A WEEDS – Eradication of these species required by law throughout Washington State Common name buffalobur common crupina cordgrass, dense flower cordgrass, salt meadow cordgrass, smooth dyers woad eggleaf spurge false brome floating primrose willow flowering rush garlic mustard giant hogweed goatsrue hawkweed, European hawkweed, yellow devil hydrilla johnsongrass knapweed, bighead knapweed, Vochin kudzu meadow clary purple starthistle reed sweetgrass ricefield bulrush sage, clary sage, Mediterranean shiny geranium silverleaf nightshade Spanish broom spurge flax Syrian bean-caper Texas blueweed thistle, Italian thistle, milk thistle, slenderflower variable-leaf milfoil velvetleaf wild four o’clock Scientific name Solanum rostratum Crupina vulgaris Spartina densiflora Spartina patens Spartina alterniflora Isatis tinctoria Euphorbia oblongata Brachyopodium sylvaticum Ludwigia peploides Butomus umbellatus Alliaria petiolata Heracleum mantegazzianum Galega officinalis Hieracium sabaudum Heracium floribundum Hydrilla verticillata Sorghum halepense Centaurea macrocephala Centaurea nigrescens Pueraria Montana var. lobata Salvia pratensis Centaurea calcitrapa Glyceria maxima Shoenoplectus mucronatus Salvia sclarea Salvia aethiopsis Geranium lucidum Solanum elaeagnifolium Spartium junceum Thymelaea passerine Zygophyllum fabago Helianthus ciliaris Carduus pycnocephalus Silybum marianum Carduus tenuiflorus Myriophyllum heterophyllum Abutilon theophrasti Mirabilis nyctaginea
CLASS B WEEDS – Control of these species is required by law in Pierce County Common name Australian fieldcress blackgrass blueweed bugloss, annual bugloss, common camelthorn common fennel common reed Dalmatian toadflax Eurasian watermilfoil fanwort gorse grass-leaved arowhead hawkweed, common hawkweed, mouse ear hawkweed, non-native hawkweed, orange hawkweed, oxtongue hawkweed, polar hawkweed, queen-devil hawkweed, smooth hawkweed, yellow hoary alyssum indigobush knapweed, black knapweed, brown knapweed, diffuse knapweed, meadow knapweed, Russian knapweed, spotted kochia lawnweed lepyrodicilis longspine sandbur loosestrife, garden loosestrife, purple loosestrife, wand parrotfeather perennial pepperweed Scientific name Rorippa austriaca Alopecurus myosuroides Echium vulgare Anchusa arvensis Anchusa officinalis Alhagi maurorum Foeniculum vulgare Phragmites australis (non-native genotypes) Linaria dalmatica Myriophyllum spicatum Cabomba caroliniana Ulex europaeus Sagittaria graminea Hieracium, lachenalii Hieracium pilosella Hieracium spp. Hieracium aurantiacum Picris hieraciodes Hieracium atratum Hieracium glomeratum Hieracium laevigatum Hieracium caespitosum Berteroa incana Amorpha fruticosa Centaurea nigra Centaurea jacea Centaurea diffusa Centaurea jacea x nigra Acroptilon repens Centaurea stoebe Kochia scoparia Solvia sessilis Lepyrodiclis holosteoides Cenchrus longispinus Lysimachia vulgaris Lythrum salicaria Lythrum virgatum Myriophyllum aquaticum Lepidium latifolium
perennial sowthistle policeman’s helmet poison hemlock rush skeletonweed saltcedar spurge, leafy sulfur cinquefoil swainsonpea tansy ragwort thistle, musk thistle, plumeless thistle, Scotch water primrose white bryony wild chervil yellow floating heart yellow nutsedge yellow starthistle
Sonchus arvensis Impatiens glandulifera Conium maculatum Chondrilla juncea Tamarix ramosissima Uphorbia esula Potentilla recta Sphaerophysa salsula Senecio jacobaea Carduus nutans Carduus acanthoides Onopordum acanthium Ludwigia hexapetala Bryonia alba Anthriscus sylvestris Nymphoides peltata Cyperus esculentus Centaurea solstitialis
NON-REGULATED NOXIOUS WEEDS – These are class B and C weeds that we highly recommend you control on your property due to the environmental and economic damage caused by their spread; but control is not legally required in Pierce County. Common name baby’s breath blackberry, evergreen blackberry, Himalayan Brazilian elodea butterfly bush cockle, white cocklebur, spiny common tansy cress, hoary dodder, smoothseed alfalfa ivy, Atlantic ivy, English (three cultivars only) ‘Star’ field bindweed fragrant waterlily goatgrass, jointed groundsel, common herb Robert knotweed, Bohemian knotweed, giant Scientific name Gypsophilia paniculata Rubus laciniatus Rubus armeniacus Egeria densa Buddleja davidii Silene latifolia ssp. Alba Xanthium spinosum Tanacetum vulgare Cardaria draba Cuscuta approximata Hedera hibernica Hedera helix ‘Baltica’, ‘Pittsburgh’, Convulvulus arvensis Nymphaea odorata Aegilops cylindrical Senecio vulgaris Geranium robertianum Polygonum bohemicum Polygonum sachalinese
knotweed, Himalayan knotweed, Japanese mayweed, scentless old man’s beard pondweed, curly-leaf reed canarygrass rye, cereal Scotch broom Spikeweed St. Johnswort, common thistle, bull thistle, Canada whitetop, hairy willow-herb, hairy wormwood, absinth yellow archangel yellow flag iris yellow toadflax
Polygonum polystachyum Polygonum cuspidatum Matricaria perforata Clematis vitalba Potamogeton crispus Phalaris arundinacea Secale cereale Cytisus scoparius Hemizxonia pungens Hypericum perforatum Cirsium vulgare Cirsium arvense Cardaria pubescens Epilobium hirsutum Artemisia absinthium Lamiastrum galeobdolon Iris pseudacorus Linaria vulgaris