Canada thistle (Creeping thistle)
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.
Wide oval, fleshy, dark green, entire, hardly petiolate, prostrate.
Erect, ramified, spineless, nearly hairless, angularly furrowed, up to 150 cm (59.05 inch) high.
First leaves inverse-ovate, following leaves lanceolate, simple to pinnatifid, wavy-ruffled, sessile.
Leaf margin with soft to hard spines.