Plants 0.5–1.5 m, strongly onion-scented. Taproot fusiform, thickened, rootstock unbranched. Stem solitary, stout, paniculate-branched, lower branches alternate, upper branches verticillate, usually pale purplish-red with age. Leaves broadly ovate, ternate-3-pinnatisect; ultimate segments gray-green, oblong, lobed or toothed, lobules lanceolate, densely pubescent, deciduous. Cauline leaves reduced upwards, sheaths lanceolate. Terminal umbel sessile, lateral umbels 2–3, with elongate peduncles exceeding terminal; umbels ca. 12 cm across; bracts absent; rays 12–23, rather short, umbels subglobose; umbellules 10–13-flowered. Petals abaxially pubescent. Stylopodium conic, base dilated; styles elongate. Fruit long-ellipsoid, ca. 14 mm; lateral ribs narrowly winged; vittae 2–3 in each furrow, 6 on commissure. Fl. and fr. May–Jul.
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