Erect perennial to 2 m high, forming large colonies from stoloniferous roots. Leaves alternate, 5–16 cm long, (3–) 10–15 cm wide, bipinnately divided; lobes linear to lanceolate, finely hairy, green to grey-green. Male capitula 2.5 mm diam., of 10–20 (–25) florets; involucral bracts fused 75% of their length; corollas densely glandular in upper part. Female capitula in clusters of 1–3, each with 1 or rarely 2 florets, sessile in upper leaf axils. Conceptacles globose, 3–4 mm long, covered with 12–15 long hooked spines and a terminal beak, pilose, and with copious subsessile golden glands.
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