Plants 55–75 cm. Root stout, long-conic. Stem branched above. Basal petioles 4–7.5 cm, winged, sheaths narrow-oblong; blade triangular or ovate-oblong in outline, 3.5–8 × 2.5–6.5 cm, pinnate/pinnatifid, rachis conspicuously winged; ultimate segments obovate to obovate-orbicular, 2–3 × 1–2.5 cm, base decurrent, margin incised-serrate, often 3-lobed, the central lobe larger than the laterals. Leaves reduced upwards. Umbels 1.5–8 cm across; peduncles 7–20 cm; bracts 4–5, leaf-like, 7–13 mm, apex usually 2–3-lobed, purple-green; rays 5–11, 1–5.5 cm; bracteoles 3–4, ovate-lanceolate or oblanceolate, 4–6 × ca. 2 mm, entire or 3-lobed; umbellules 6–12 mm across, 7–14-flowered; pedicels 3–5 mm. Calyx teeth suborbicular or ovate-triangular, ca. 0.2 mm. Petals white, 2–2.2 mm. Fruit broadly ovoid, 2–3.5 × 2.5–4 mm; ribs filiform, somewhat sinuate; vittae 2 in each dorsal furrow, 3 in each lateral furrow, 4 on commissure. Seed face concave. Fl. May–Aug, fr. Jul–Sep.
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