Plants 5–75 cm. Root tuberous, globose, 3–4 mm across. Stem slender, thinly ribbed. Basal leaves petiolate, petioles 2–5 cm, sheaths short; blade broad-triangular, 2–5 × 3–6 cm, 2-ternate-pinnate; pinnae petiolules ca. 7 mm; ultimate segments cuneate-obovate, ca. 4 × 3 mm, subsessile, apex 3-toothed. Stem leaves long-petiolate, petioles 1–4 cm; ultimate segments rhombic-ovate, ca. 2 × 1 mm, apex incised-serrate. Umbels 2–5 cm across; peduncles 0.5–13 cm; bracts absent or 1, linear; rays 3–7, 2–5 cm, distinctly unequal; bracteoles absent; umbellules 7–10 mm across, 3–8-flowered; pedicels 2–10 mm, distinctly unequal. Calyx teeth obsolete. Petals white, ovate, ca. 1 × 0.5 mm; apex acute. Fruit oblong, ca. 2 × 1.2 mm, apex slightly separated; ribs filiform; vittae 1 in each furrow, 2 on commissure. Fl. Jul, fr. Aug–Sep.
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