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Island County > Public Health > Natural Resources > Noxious Weed Control Board > Noxious Weed Pictorial Index - 2018

​Noxious Weed Pictorial Index - 2018


Island County property owners are:

Required to eradicate the Regulated Class A Noxious Weeds.

Click on images to learn more.

​Spartina anglica
cordgrass, common
Spartina anglica
 ​Spartina densiflora
cordgrass, denseflowered
Spartina densiflora
 ​Alliaria petiolata
garlic mustard
Alliaria petiolata
​giant hogweed
giant hogweed
Heracleum mantegazzianum
 ​bighead knapweed
knapweed, bighead
Centaurea macrocephala
 ​Meadow Clary
meadow clary
Salvia pratensis
​purple starthistle
Purple starthistle
Centaurea calcitrapa
 ​Clary Sage
sage, clary
Salvia sclarea
 ​Spanish broom
Spanish broom
Spartium junceum
​Milk Thistle
thistle, milk
Silybum marianum
 ​
 ​


Required to control the Regulated Class B Noxious Weeds and asked to control the Non-Regulated Class B Noxious Weeds.

Click on images to learn more.

​Brazilian elodea
Brazilian elodea
Egeria densa
 butterflybush​
butterflybush
Buddleja davidii
 ​common fennel
common fennel
Foeniculum vulgare
​Common Reed
common reed (non-native genotypes)
Phragmites australis
 ​Dalmatian toadflax
Dalmatian toadflax
Linaria dalmatica ssp. dalmatica
 ​Eurasian watermilfoil
Eurasian watermilfoil
Myriophyllum spicatum
​gorse
Gorse
Ulex europaeus
 ​hairy willowherb
hairy willowherb
Epilobium hirsutum
 ​hawkweed, orange
hawkweed, orange
Hieracium aurantiacum
​
Hawkweed, yellow
Hieracium caespitosum
 herb-Robert​
herb-Robert
Geranium robertianum
 ​knapweed, brown
knapweed, brown
Centaurea jacea
​knapweed, diffuse
knapweed, diffuse
Centaurea diffusa

 knapweed, meadow​
knapweed, meadow
Centaurea jacea x nigra
 ​knapweed, spotted
knapweed, spotted
Centaurea stoebe
​knotweed, Bohemian
knotweed, Bohemian
Polygonum x bohemicum
 ​knotweed, giant
knotweed, giant
Polygonum sachalinense
 knotweed, Himalayan​
knotweed, Himalayan
Polygonum polystachyum
​knotweed, Japanese
knotweed, Japanese
Polygonum cuspidatum
 ​loosestrife, purple
loosestrife, purple
Lythrum salicaria
 ​parrotfeather
parrotfeather
Myriophyllum aquaticum
​poison hemlock
poison hemlock
Conium maculatum
 ​Scotch broom
 Scotch broom
Cytisus scoparius
 ​spurge laurel
spurge laurel
Daphne laureola
​sulfur cinquefoil
sulfur cinquefoil
Potentilla recta
 ​tansy ragwort
tansy ragwort
Senecio jacobaea
 ​thistle, musk
thistle, musk
Carduus nutans
​velvetleaf
velvetleaf
Abutilon theophrasti
 ​wild chervil
wild chervil
Anthriscus sylvestris
 ​yellow archangel
yellow archangel
Lamiastrum galeobdolon 



Required to control the Regulated Class C Noxious Weeds and asked to control the Non-Regulated Class C Noxious Weeds.

Click on images to learn more.

​bull thistle
bull thistle
Cirsium vulgare
 ​Canada thistle
Canada thistle
Cirsium arvense
 ​absinth wormwood
absinth wormwood
Artemisia absinthium
​babysbreath
babysbreath
Gypsophila paniculata
 ​buffalobur
buffalobur
Solanum rostratum
 ​common catsear
common catsear
Hypochaeris radicata
​common groundsel
common groundsel
Senecio vulgaris
 ​common St. Johnswort
common St. Johnswort
Hypericum perforatum
 ​common tansy
common tansy
Tanacetum vulgare
​common teasel
common teasel
Dipsacus fullonum
 ​curlyleaf pondweed
curlyleaf pondweed
Potamogeton crispus
 ​English ivy – four cultivars only
English ivy – four cultivars only 
Hedera helix ‘Baltica’, ‘Pittsburgh’, and ‘Star’
H. hibernica ‘Hibernica’
​evergreen blackberry
evergreen blackberry
Rubus laciniatus
 ​field bindweed
field bindweed
Convolvulus arvensis
 ​Himalayan blackberry
Himalayan blackberry
Rubus armeniacus
​Italian arum
Italian arum
Arum italicum
 ​Japanese eelgrass
Japanese eelgrass
Zostera japonica
 ​jubata grass
jubata grass
Cortaderia jubata
​old-man’s-beard
old-man’s-beard
Clematis vitalba
 oxeye daisy​
oxeye daisy
Leucanthemum vulgare
 ​pampas grass
pampas grass
Cortaderia selloana
​reed canarygrass
reed canarygrass
Phalaris arundinacea
 ​scentless mayweed
scentless mayweed
Matricaria perforata
 ​smoothseed alfalfa dodder
smoothseed alfalfa dodder
Cuscuta approximata
​wild carrot
wild carrot
Daucus carota 
 ​yellowflag iris
yellowflag iris
Iris pseudacorus
 ​yellow toadflax
yellow toadflax
Linaria vulgaris