Plants 2–3 m. Stem slender, purplish red-tinged, 2 × corymbose-branched, lower branches alternate, upper branches verticillate, branchlets often opposite, rarely alternate or single. Basal leaves long-petiolate, articulate between petiole and blade; blade triangular-ovate, 3-ternate, leaflets 2-pinnatisect; ultimate segments broadly elliptic or long-elliptic, 10–30 × 5–20 mm, abaxially pubescent, pinnate, lobules entire or toothed. Upper leaf bladeless, sheaths lanceolate. Umbels 4–8 cm across, terminal on stem, branches and branchlets; bracts absent; rays 6–12, subequal; bracteoles several, lanceolate or subulate, persistent; umbellules 12–17-flowered. Stylopodium low-conic, base dilated. Fruit ellipsoid, ca. 7 × 3 mm; vittae small, 1 in each furrow, 2 on commissure. Fl. Jun, fr. Jul.
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