Plants 30–80 cm. Taproot and rootstock stout, reddish-brown. Stem solitary, erect, purplish, hollow, pubescent. Basal petioles with purplish, puberulous and scarious-margined sheaths, not auriculate at apex; leaf blade triangular-ovate, 3-pinnatisect; pinnae 3–5 pairs, pinnules 3–4 pairs; ultimate segments linear, 3–10 × 1–1.6 mm, both surfaces glabrous, apex mucronate. Umbels 5–10 cm across; bracts 6–10, linear, 10–15 × ca. 0.5 mm, puberulous; rays numerous, 24–40, subequal, 3–5 cm; bracteoles ca. 10, linear-lanceolate; umbellules ca. 20-flowered. Calyx teeth conspicuous, triangular, acute. Fruit ellipsoid, 4–6 × 3–4 mm, glabrous; dorsal ribs slightly prominent, lateral ribs narrowly winged, wings rather thick; vittae 1–2(–3) in each furrow, 4–6 on commissure. Fl. Jul–Aug, fr. Sep–Oct.
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