Plants to 1 m, essentially glabrous. Stem solitary, much branched above, branches long and slender. Basal leaf blade broadly triangular-ovate, 3–4-pinnate, pinnae 3–4 pairs; petiole long, 17–33 cm; ultimate segments long-obovate, 1.5–4.5 × 0.4–1.4 cm, base cuneate, 1–2-lobed or toothed towards apex, apex apiculate. Stem leaves reduced upwards, petioles short or wholly sheathing, segments linear or oblanceolate, 10–20 × 3–5 mm. Umbels 1–8 cm across; bracts absent or 2–3, linear, 5–7 × ca. 0.5 mm; rays 8–13, unequal, 4-ridged, sparsely pubescent; bracteoles 8–12, ovate-lanceolate, as long as or slightly longer than flowers. Calyx teeth obsolete. Petals white. Styles short. Fruit oblong-ellipsoid, 3–4 × 2.5–3 mm, glabrous; lateral ribs winged, wings thick; vittae 2–3 in each furrow, 4 on commissure. Fl. and fr. Aug–Oct.
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