Canada

Ox-eye daisy (dog daisy)

Chrysanthemum leucanthemum (Leucanthemum vulgare)

Perennial herb; stems ± hairy below, ± glabrous above, ascending, simple or branched, 30–90 cm high, striate.

Leaves obovate to spathulate, 6–12 cm long, 20–30 mm wide, apex obtuse, coarsely singly to doubly toothed, crenate or shallowly 1–2-pinnatifid, ± glabrous, stem-clasping; becoming smaller, sometimes entire, base often auriculate towards heads, sessile.

Heads 1–3 in corymb, usually 3–5 cm diam.; involucral bracts 3–8 mm long, lanceolate, margins and apex brown; inner bracts with expanded broad apical flap. Ray florets c. 18, ligules white, entire or toothed. Disc florets numerous, bright yellow.

Achenes c. 2.5 mm long; disc achenes with 10 ± equal ribs, corona absent; ray achenes sometimes flattened with ± extended lateral ribs, sometimes with irregular corona.