Plants 60–90 cm, essentially glabrous. Rootstock elongate, woody, bearing annular leaf scars. Basal leaves several; petioles rigid; leaf blade broadly triangular, 3-pinnatisect, pinnae 5–7 pairs; ultimate segments ovate-lanceolate (sometimes oblong or linear), base cuneate or decurrent, 1–3-toothed or-lobed, 1–3(–4) × 0.4–1.5 cm, thinly coriaceous, abaxially glaucous. Umbels 4–8 cm across; peduncles stout; bracts absent or occasionally 1–2, linear, membranous; rays 12–26, unequal, 1–4 cm, 4-angled, inner faces scaberulous; bracteoles 2–4, linear or subulate, shorter than flowers; umbellules 10–20-flowered. Calyx teeth obsolete. Petals white. Fruit long-ellipsoid, 3–5 × 2.5–3 mm, glabrous; lateral ribs broadly winged, wings rather thick; vittae 1–2 in each furrow, 4–6 on commissure. Fl. Jul–Aug, fr. Sep–Oct.
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