Annual herb to 100 cm high. Stems with sparse eglandular hairs. Leaves divergent, with eglandular hairs, sessile, apically pungent; upper leaves 3–11 mm long, 0.6–1 mm wide, entire; lower leaves longer and pinnatifid to bipinnatifid. Capitula sessile, hemispherical, in upper axils and terminal, 7–11 mm diam. at anthesis; involucral bracts 15–20, lanceolate, pungent, persistent; receptacle scales pungent. Ray florets 15–20; ligules 3–5 mm long. Disc florets numerous, mostly male; corolla tube 3–3.5 mm long, glabrous; lobes deltate, 0.2–0.3 mm long, glabrous; anthers c. 1.8 mm long. Achenes 1.5–2 mm long, somewhat rugose, dark brown to black, beaked.
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