Canada thistle

Cirsium arvense

Perennial weed with deep taproot and deep-set, initially perpendicularly-running root stolons that later bend downward geniculately, non-lacteal.
C. arvense likes nitrogen and has a very high phenotypic variability with different subspecies.

Prickly leaves, lilac florets.

Cotyledons: Wide oval, fleshy, dark green, entire, hardly petiolate, prostrate.

Stems: Erect, ramified, spineless, nearly hairless, angularly furrowed, up to 150 cm (59.05 inch) high.

Leaves: First leaves inverse-ovate, following leaves lanceolate, simple to pinnatifid, wavy-ruffled, sessile. Leaf margin with soft to hard spines.

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