Plants 0.8–1 m tall. Root cylindrical. Stem solitary, slender ca. 8 mm thick at base, branches few, sparsely puberulent. Basal leaves, pinnate, long-petiolate; petiole to 25 cm, narrowly sheathing at base; pinnae 2–3 pairs, ovate or broad-ovate in outline, 3–10 × 3–9 cm, deeply lacerate almost to base into 3 or 5 narrowly ovate lobes, both surfaces puberulent along veins, margins serrate. Cauline leaves gradually reduced, ternate/pinnate; leaflets broad-ovate, 8–9 × 3–8 cm, pinnatifid. Umbels ca. 13 cm wide; bracts 1, or absent; rays 10–25, 2–5(–9) cm, scabrous; bracteoles 2–5, linear, 2–4 mm; umbellules 15–25-flowered. Calyx teeth obsolete or minute. Petals white, outer flowers in umbels radiant; ovary scabrous. Fruit obovoid, 7–10 × 6–7 mm, lateral ribs winged, wings narrower than fruit body; vittae solitary in each furrow, 2 on commissure, clavate, ca. 3/4 length of mericarp. Seed face slightly concave. Fl. Jul–Aug, fr. Aug–Sep.
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