Annual herb 0.5–2.5 m high; stem purplish, branched above, sparsely pilose to glabrous.. Leaves narrowly deltoid in outline, bipinnatifid to pinnately 3–5-partite, 3.5–10.5 cm long, 2.5–7.5 cm wide, segments rhomboidally ovate or lanceolate, dentate, scabrid-pubescent above, pubescent beneath, glandular-punctate.. Capitula terminal, in lax cymes; peduncle to 5.5 cm long; involucre 5–7 mm long; outer phyllaries 8–10, hispid, inner phyllaries 8, orange, sparsely pubescent or glabrous; paleae to 8 mm long.. Ray florets yellow or orange-yellow, neuter, 8–10, rays 10–25x6–7 mm; disc florets yellow, 3.5–4 mm long.. Achenes black, narrowly ellipsoid, 4–7 mm long, hairy in upper part; aristae 2, 1–2.2 mm long, antrorsely barbed.
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