Plants 20–40 cm, glabrous. Stem solitary, ribbed, branched. Basal and lower petioles 8–15 cm, flattened, sheaths narrow-oblong, 3–5 cm broad; blades ovate or oblong-ovate, 4–7 × 1.5–3.5 cm, 2–3-ternate-pinnate; pinnae 4–6 pairs, sessile; ultimate segments linear-lanceolate, 4–18 × 1–4 mm, acute. Leaves gradually reduced upwards. Umbels 5–7 cm across; bracts 4–7, lanceolate, 1–1.5 cm; rays 5–11, 1–5 cm, very unequal; bracteoles 5, 5–8 mm, lanceolate, pale green, apex entire acute, pedicels 7–16, 2–5 mm. Calyx teeth conspicuous, broad-triangular. Petals broad-ovate, purplish, margin white. Anthers yellow-green. Stylopodium green, short-conic. Fruit broad-ovoid or subglobose, 3–4 × 2.5–3.5 mm; ribs all broadly sinuolate-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jul, fr. Aug.
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