Plants 16–60 cm. Root tuberous, globose, 2–10 mm across. Stem slender, thinly ribbed. Basal leaves petiolate, petioles 2.5–5 cm, sheaths short, narrow; blade broad-triangular, 3–5 × 3–6 cm, 2-pinnate; pinnae 2–3 pairs, proximal pinnae short-petiolulate; ultimate segments broad-ovate to obovate, 5–12 × ca. 6 mm, apex 3-lobed or sparsely obtuse-serrate. Leaflets of the upper leaves linear. Umbels 5.5–7.5 cm across; peduncles 2.5–7 cm; bracts and bracteoles absent; rays 2–6, 1–3(–4.5) cm, unequal; umbellules 4–20 mm across, 2–5-flowered; pedicels 4–10 mm, slender, unequal. Calyx teeth obsolete. Petals purplish-red, narrow-lanceolate, ca. 4 × 0.2–0.3 mm; apex linear, ca. 2 mm, finely papillate or glabrous. Fruit broad-ovoid, ca. 2 × 2 mm, base rounded or slightly cordate; ribs filiform; vittae 3 in each furrow, 4–6 on commissure. Fl. Aug, fr. Sep–Oct.
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