Perennial, strongly aromatic to inodorous, 20-100 (-150) cm tall herb, with erect or ascending, costate-striate, greenish-yellow, sparsely hairy to glabrous stems. Leaves short stalked to sessile, mostly undivided, occasionally lower 3-5-cleft, usually glabrous, sometimes sparsely appressed canescent, linear-lanceolate to occasionally ± oblanceolate, 2-8 cm x (1-) 2-8 (-10) mm, entire, acute; upper ones mostly simple, much reduced in floral region. Capitula numerous, heterogamous, globose, 2-3 x 3-4 mm, remote to approximate, nodding on curved, 1-2 mm long, hairy or glabrous peduncles, in leafy, narrow panicle with ascending to erect, sometimes appressed, up to 10 cm long branches. Involucre 3-seriate, phyllaries glabrous, outermost oblong, c. 2.5 x 1 mm, obtuse, inner ones broadly elliptic, c. 3.5 x 2 mm, broadly whitish scarious, obtuse. Receptacle conico-hemispherical, glabrous. Florets up to 40, yellow; marginal-florets 6-15, fertile, with 0.5-1 mm long, glandulose, 2-fid corolla; disc-florets 10-20, bisexual, sterile, with campanulate, 2-2.5 mm long, 5-toothed corolla. Cypselas brown, ellipsoid, 0.6-1 mm long.