Plants perennial, 50–100 cm, glabrous. Root cylindrical, 10–15 × ca. 0.5 cm. Stem purplish. Basal petioles 3–12 cm; blade 3–4-pinnate; ultimate segments linear, 5–25 × 1–2 mm. Cauline leaves similar to basal, 1-pinnate or 3-lobed. Umbels 5–10 cm across; bracts absent; rays 6–10, 1–2.5 cm, unequal; bracteoles 3–7, linear, 3–4 mm, ca. equal to or shorter than pedicels; umbellules 5–15 mm across, 6–13-flowered; pedicels 4–6 mm. Calyx teeth conspicuous, acute or subulate, ca. 0.3 mm. Petals white, apex with incurved lobule. Stylopodium short conic; styles 2–3 × stylopodium, recurved. Fruit oblong-ovoid, 2.5–3 × 1.5–2 mm, glabrous; vittae 3 in each furrow, 6 on commissure. Seed face plane. Fl. Jul–Aug, fr. Sep–Nov.
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