Tripleurospermum maritimum subsp. inodorum

Erect or ascending, rarely prostrate, annual to c. 1 m high, ± glabrous; stems branching, sparsely hairy when young, yellowish-green, sometimes reddish at base. Leaves petiolate becoming sessile upwards, oblong, elliptical or ovate in outline, 1.5–6 cm long, 1–4 cm wide, 3-pinnatisect, ultimate lobes filiform, 0.6–1 mm wide, apiculate. Capitula 3–4.5 cm diam., solitary or few; peduncles sparsely hairy; involucral bracts oblong or narrowly triangular, 5–8 mm long, with pale brown scarious margins; receptacle hemispherical. Ray florets 10–25, ligules 8–18 mm long, white; disc florets numerous, 1–2.5 mm long, yellow. Cypselas obovoid, 1.4–2.2 mm long, minutely wrinkled between ribs, apical scarious rim c. 0.2 mm high present. Flowers most of the year.