Plants 40–100 cm high, robust, strongly aromatic. Root brownish, cylindric, branched, crown stout, 1–2 cm across, annular ringed. Stem purple-tinged at base. Basal and lower petioles 10–30 cm, sheath oblong; blades broad-ovate, 15–30 cm, 3–4-pinnate; pinnae 3–5 pairs, long-petiolulate; ultimate segments ovate or obovate, 1–3 × 0.7–2.3 cm, irregularly coarse-dentate, scabrous on rachis, nerves and margins. Leaves reduced upwards. Umbels large, 10–28 cm across; peduncle up to 20 cm; bracts 6–8, very variable, similar to uppermost leaves, 4–10 cm, margin densely scabrid with flattened hairs, apex entire, 3-lobed or pinnate; rays 20–40, 4–12 cm; bracteoles ca. 10, linear-lanceolate, 1.5–3 cm, densely scabrid with flattened hairs, margin narrow, white; pedicels numerous, ca. 1 cm. Calyx teeth obsolete. Petals obovate, white. Stylopodium short-conic. Fruit oblong, 0.7–1 × 0.5–0.6 mm; ribs all broadly thick-winged; vittae 2–3 in each furrow, 6–7 on commissure. Fl. Jul–Aug, fr. Aug–Sep.
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