Tanacetum vulgare

Erect, simple or few-branched perennial herb 30–150 cm high; stems ribbed, glandular-pubescent when young. Leaves ovate to obovate in outline, 12–25 cm long, 3–12 cm wide, pinnatisect, with 21–29 lanceolate, dentate, concave segments, both surfaces glabrous to sparsely pubescent, glandular; petiole 0–5 cm long. Capitula 5–100, 5–9 mm diam.; involucral bracts 2–4.5 mm long, outer ones ovate, keeled, acute to subacute, inner ones oblanceolate, flat, with an obtuse laciniate hyaline apex. Florets bright yellow; outer ones tubular, rarely minutely ligulate or absent; inner ones many. Cypselas 1.2–1.8 mm long, 5-ribbed; pappus a small scarious toothed crown 0.2–0.4 mm long. Flowers spring–autumn.