Noxious Weeds in Snohomish County 2011: Classes and Status

Weed List: Class A

Class A noxious weeds are those noxious weeds not native to the state that are of limited distribution or are unrecorded in the state and that pose a serious threat to the state. These weeds are a threat to all counties of the state and eradication is required.

Common Name   bean-caper, Syrian blueweed, Texas broom, Spanish buffalobur clary, meadow cordgrass, smooth cordgrass, common cordgrass, salt meadow cordgrass, denseflower crupina, common European hawkweed false brome flax, spurge floating primrose-willow flowering rush four o' clock, wild hawkweed, yellow devil hogweed, giant hydrilla johnsongrass knapweed, bighead knapweed, Vochin kudzu mustard, garlic nightshade, silverleaf reed sweatgrass ricefield bulrush sage, clary sage, Mediterranean shiny geranium spurge, eggleaf starthistle, purple thistle, Italian thistle, milk thistle, slenderflower velvetleaf variable-leaf milfoil woad, dyers

Scientific Name   Zygophyllum fabago Helianthus ciliaris Spartium junceum Solanum rostratum Salvia pratensis Spartina alterniflora Spartina anglica Spartina patens Spartina densiflora Crupina vulgaris Hieracium sabaudum Brachypodium sylvaticum Thymelaea passerina Ludwigia peploides Butomus unbellatus Mirabilis nyctaginea Hieracium floribundum Heracleum mantegazzianum Hydrilla verticillata Sorghum halepense Centaurea macrocephala Centaurea nigrescens Pueraria montana var. lobata Alliaria petiolata Solanum elaeagnifolium Gyceria maxima Schoenoplectus mucronatus Salvia sclarea Salvia aethiopis Geranium lucidum Euphorbia oblongata Centaurea calcitrapa Carduus pycnocephalus Silybum marianum Carduus tenuiflorus Abutilon theophrasti Myriophyllum heterophyllum Isatis tinctoria