Diffuse Knapweed - Centaurea diffusa

Key Features: Much-divided, "cobwebby" basal leaves; generally white flowers; triangular, spine-tipped bracts

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

Nodding Thistle - Carduus nutans
Other Names - Musk Thistle

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

Ox-eye Daisy - Chrysanthemum leucanthemum
Other Names - White Daisy

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

Purple Loosestrife - Lythrum salicaria

Key Features: leaves in twos or threes at stem nodes; square stems; showy, magenta flowers in long, dense, leafy spikes

Scentless Chamomile - Matricaria perforata
Other Names - Scentless Mayweed

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

Spotted Knapweed - Centaurea maculosa

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

Stork's-bill - Erodium cicutarium
Other Names - Redstem filaree

Key Features: Three-lobed cotyledons on seedling; low, spreading growth habit; distinct bill of the fruit and coiled tail on the seed

Tansy - Tanacetum vulgare
Other Names - Common Tansy

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

White Cockle - Silene alba

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

Yellow Toadflax - Linaria vulgaris
Other Names - Butter-and-eggs, Wild Snapdragon

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"