Plants perennial, 70–160 cm. Stem hollow, much branched above, scabrous. Basal and lower leaves petiolate, petioles 2–5 cm, slender, scabrous; blade ovate-triangular, 3–10 × 2.5–7 cm, deeply 1–2-pinnatifid; ultimate segments broad-ovate, ovate-lanceolate or nearly ovate-triangular, 1–3.5 × 0.5–2.5 cm, base cuneate, truncate or cordate, irregularly serrate or dentate, strigose on both surfaces, apex acuminate. Leaves reduced upwards, ultimate segments becoming narrow. Umbels many, 2.5–4 cm across, lax; peduncles 1–4 cm, slender; bracts and bracteoles absent; rays 3–8, 1–2 cm, very slender, spreading widely; umbellules 3–8-flowered, 3–5 mm across; pedicels very thin, 0.5–2 mm, unequal. Petals white, ca. 0.8 × 0.7 mm. Fruit ovoid-globose, 0.9–1.1 × 1.1–1.3 mm across, base cordate, surface scabrous with short appressed hairs. Fl. and fr. Jul–Sep.
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