Plants (7–)30–60 cm, glabrous. Root fusiform. Stems single or 2–3, 1–2-branched. Basal petioles 3–7 cm; blade oblong or lanceolate, (3–)5–10 × (2–)3–5 cm, 2–3-pinnate; ultimate segments oblanceolate, 2–3 × 0.5–1 mm, 3-lobed at the apex. Cauline leaves 1–2, similar to basal, reduced. Umbels terminal and lateral, 4–7 cm across; bracts 2–3, linear, entire, apex caudate, rarely 1–2-pinnate; rays (5–)8–10, unequal, (1.5–)3–8 cm; bracteoles 5–7, linear-lanceolate, entire, caudate or apex 2–3-lobed, rarely pinnate, connate at base; umbellules many-flowered. Calyx teeth triangular, ca. 0.4 mm. Petals white, obovate, base shortly clawed. Styles erect to divergent. Fruit oblong-ovoid, ca. 3 × 2 mm; ribs all narrowly winged; vittae 4–5 in each furrow, 8–10 on commissure. Seed face slightly concave. Fl. Jul–Aug, fr. Sep.
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