Plants 60–80 cm tall. Root cylindrical. Stem solitary, little-branched. Basal leaves pinnate; pinnae 2–3 pairs, ovate, 9–12 × 7–9 cm, 2–3-lobed to pinnatifid, sparsely pubescent on both surfaces, margins serrate; terminal leaflets rhombic, 10–13 × 8–12 cm, 3-lobed, base decursive winged. Cauline leaves gradually reduced upward. Umbels ca. 13 cm wide; bracts 8–10, lanceolate, caudate at apex, sparsely pubescent, or caducous; rays 20–25, unequal, 2–6 cm; bracteoles 5–7, similar to the bracts, or linear, unequal, narrow membranous at the margins, equal to or slightly longer than pedicels (characteristic of this species). Calyx teeth minute. Petals white, outer flowers in umbels radiant, enlarged petals broadly obcordate, deeply lobed. Ovary sparsely hirsute. Fruit suborbicular, ca. 7 × 7 mm, dorsal ribs filiform, lateral ribs broadly winged; vittae solitary in each furrow, 2 on commissure, about 2/3 length of mericarp. Seed face plane. Fl. and fr. Jul–Oct.
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