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Prohibited Noxious Weeds Found in the M.D. of Wainwright

Prohibited Noxious weeds pose a serious threat and must be eradicated. These weeds spread rapidly and are highly competitive. Weeds in this category are restricted to prevent establishment in Alberta.

Hoary Alyssum (Berteroa incana)

Key Features: Greyish-green leaves with star shaped hairs; white, small, deeply notched petals on slender stalks, sepals hairy

Spotted Knapweed (Centaurea maculosa)

Key Features: deeply lobed, "cobwebby" basal leaves; generally purple flowers; oval bracts with a black-tipped fringe

Nodding Thistle (Carduus nutans)

Key Features: winged prickles along the stem, except below flower heads; large, nodding, purple flower heads; involucral bracts spine-tipped and bent backwards

Noxious Weeds Found in the M.D. of Wainwright

Noxious Weeds have the ability to spread rapidly, cause severe crop losses and economic hardship. These weeds must be controlled to prevent further establishment and spread.

Common Baby's-breath (Gypsophila paniculata)

Key Features: Opposite and lance shaped leaves; numerous branches; numerous small white flowers with 5 petals

Downy Brome (Bromus tectorum)

Key Features: Leaf blades are 2-4 mm wide, 5-12 cm long covered with soft hairs; often reddish-purple when mature, covered with soft hairs, long awns

Great Burdock (Arctium lappa) & Lesser Burdock (Arctium minus)

Key Features: Large heart-shaped leaves, wooly nderneath; clusters of purple-pink flowers

Scentless Chamomile (Matricaria perforata)

Key Features: Finely-divided leaves; noticeable lack of odor; daisy-like heads at full maturity resemble a badminton shuttlecock

Yellow Clematis (Clematis tangutica)

Key Features: Leaf tips are pointed and edges are coarsely toothed; flowers are yellow with 4 petals, bell shaped

White Cockle (Silene alba)

Key Features: opposite, softly hairy leaves; swollen nodes; large, white, showy flowers; capsule opening by ten teeth

Oxeye Daisy (Chrysanthemum leucanthemum)

Key Features: short, creeping roots; spoon-shaped, coarsely-toothed basal leaves; strong, unpleasant odor

Leafy Spurge (Euphorbia esula)

Key Features: white latex in all parts of the plant; deep and spreading roots with buds; greenish-yellow bracts underneath the flower groupings

Common Tansy (Tanacetum vulgare)

Key Features: Short rhizomes; fern-like, aromatic leaves; yellow, button-like heads in clusters

Canada Thistle (Cirsium arvense)

Key Features: Alternate, wavy, lance shaped, lobed, spine-tipped and lack stalks; purple fading to white flowers

Yellow Toadflax (Linaria vulgaris)

Key Features: found in patches due to creeping roots; crowded, linear leaves that are narrower at each end; bright yellow and orange flowers that are "snapdragon-like"

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