Plants 80–120 cm. Root little-branched; rootstock 1–1.5 cm thick, clothed with remnant sheaths. Basal leaves numerous, petioles 10–15 cm; blade ovate-triangular, 12–15 × 13–15 cm, 3-pinnate, rigid when dry; pinnae 3–6 pairs, triangular or narrowly ovate-triangular; pinnules 3–4 pairs, lower pinnules short-petiolulate, pinnatisect; ultimate segments mucronate, acute-dentate. Umbels 2–6, 1.5–2.5 cm across, rays elongating in fruit becoming conspicuously compound umbel when mature; peduncles 5–10 cm; bracts absent; umbellules 6–18-flowered; pedicels stout, 2–3 mm; bracteoles 4–8, subulate, ca. 6 mm. Petals dark brown, broad-ovate, spoon-like, ca. 1.5 × 1–1.2 mm, apex acute. Filaments greenish white, ca. 1 mm; anthers dull green. Fruit broadly obovoid, ca. 3 × 1.5 mm; ribs conspicuous. Fl. and fr. Aug–Sep.
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