Scented, rhizomatous herb. Stems erect, up to c. 1 m tall, angled and hairy above, slightly ribbed and ± glabrous toward base, usually not branched except above to form infl. Basal lvs 0 at anthesis. Cauline lvs apetiolate, linear, glabrous, sometimes sparsely hairy when young, simple, finely and evenly serrate and serrations again with very fine cartilaginous teeth, up to 80 × 3-5 mm, becoming smaller and more lanceolate toward infl. Corymbs convex, to c. 10 cm across, with few to numerous, loosely-packed capitula. Involucral bracts sparsely hairy, 2-4 mm long; margin brown, hairy. Capitula c. 10-15 mm diam.; ray florets 8-numerous; ligule and disc florets white. Achenes grey-brown, c. 2 mm long; wings narrow, pale brown.