Plants perennial, 40–100 cm, generally glabrous. Rootstock short, thick, ca. 3 × 1.5 cm; roots fusiform. Stem solitary, stout, 3–4-branched. Basal petioles 10–15 cm; blade 1–2-pinnate; pinnae 2–3 pairs; ultimate segments ovate or ovate-lanceolate, 3–4 × 1.5–3 cm, margins serrate. Cauline leaves similar to the basal, smaller, sessile, 3-lobed, lobes lanceolate. Terminal umbels 3–8 cm across, lateral umbels smaller; bracts 0, occasionally 1, linear, like uppermost leaf; rays (7–)15–25, (1–)2–3.5 cm, ca. equal; bracteoles 1–5, linear, 2.5–4 mm, reflexed, nearly as long as pedicels; umbellules ca. 13 mm across, 10–20-flowered; pedicels 3–9 mm. Calyx teeth obsolete. Petals white, obovate or ovate, apex notched with incurved lobule. Stylopodium conic; styles ca. 2–4 × stylopodium, reflexed or spreading. Fruit ovoid, ca. 3 × 1.8 mm, base cordate, surface sparsely pubescent or glabrous; vittae 2–3 in each furrow, 4 on commissure. Seed face plane. Fl. Jul–Aug, fr. Aug–Oct.
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