Annual glandular-pubescent aromatic herb up to 1 m. tall, sparingly branched. Lvs opp. on petioles up to c. 1 cm. long; lamina lanceolate to ovate-triangular to rhomboid, 3-10 cm. long, membr., irregularly toothed or lobed, acuminate. Capitula c. 6-8 mm. diam., in lax panicles. Outer phyll. glandular, narrow-spathulate; inner shorter. Scales of receptacle clasping achenes. Florets yellow; of disk tubular, perfect; of ray shortly ligulate, pistillate. Pappus 0, outer achenes muricate.

Annual herb, 20-100 cm tall. Stems usually moderately to densely hairy, sometimes only sparsely hairy or becoming glabrous below, much-branched often from base and above. Lower and mid cauline lvs moderately to densely clothed in broad-based hairs on upper surface and in simple and sessile glandular hairs on lower surface, usually apetiolate or shortly petiolate but lamina long-cuneate at base, usually triangular or ovate-triangular, sometimes ovate-elliptic, subacute to acute at apex, ± entire to irregularly toothed with larger teeth toward base, 3-10-(17) cm long. Upper cauline lvs becoming smaller, narrow- elliptic or lanceolate, short-cuneate or obtuse at base and less distinctly toothed. Capitula (excluding bracts) 6-10 mm diam., in loose panicles. Outer involucral bracts 5, clothed in conspicuous, mostly stalked, glandular hairs and sometimes simple hairs, linear-spathulate, 5-10 mm long, much > inner bracts. Inner bracts 5-11, with sparse simple hairs and sometimes few to many glandular hairs, obovate, c. 3 mm long, enfolding outer achenes. Receptacular scales similar to inner bracts, usually with simple hairs at apex only. Ray florets 3-5; ligules yellow, 3-fid. Disc florets 4-20, yellow. Achenes glabrous, dark brown-black, curved, irregularly 3-4-angled, 2-3 mm long.