Plants 40–70 cm, glabrous throughout. Root long-conic, chocolate-brown, slightly aromatic; caudex ca. 1 cm, clothed with few remnant sheaths. Basal leaves several, petioles 16–19 cm, sheaths narrowly lanceolate; blade broad-ovate, 13–16 × 8–12 cm, 3–4-pinnate/pinnatifid; pinnae 6–8 pairs, pinnules 4–5 pairs; ultimate segments obovate to linear, 2–5 × 1.5–4 mm, 2–3-parted or entire, margin narrowly reflexed, apex apiculate, usually gray-green, thick, papery. Stem leaves 1–2, reduced and less divided, petioles wholly sheathing, sheaths oval-lanceolate. Umbels 5–6 cm across; bracts 1–4, linear-lanceolate, 3–7 × 0.5–1 mm, unequal, apex caudate; rays 8–12, 2–5 cm, unequal; bracteoles 6–8, linear-lanceolate, ca. 3 × 1 mm, apex caudate; umbellules 6–15-flowered; pedicels 0.5–1 mm, ca. 2 mm in fruit. Fruit ellipsoid-oblong, ca. 4 × 2.5 mm; ribs all broadly winged; vittae 2 in each furrow, 5–6 on commissure. Fl. Jul–Aug, fr. Sep.
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