Plants 50–80 cm. Rootstock elongate, annular leaf scars numerous and prominent, often deep purplish. Stem base purplish and shallowly fluted. Leaf blade triangular-ovate in outline, 2-pinnate; pinnae 4–6 pairs, both surfaces glabrous or occasionally adaxially pubescent on veins, abaxially glaucous, nerves reticulation conspicuous, margins 1–3-lobed, irregularly serrate; pinnules 2–3 pairs; ultimate segments 3–4.5 × 1–3 cm, lateral segments ovate, 2–3-lobed, base round-obtuse, apical pinnules obovate, base cuneate. Synflorescence much branched; umbels 8–12 cm across; bracts absent or 1, linear or ovate; rays 10–23, 3–6 cm, pubescent on inner face; bracteoles 8–14, narrowly ovate or linear, unequal; umbellules ca. 20-flowered. Calyx teeth ovate, small. Petals white. Styles longer than stylopodium. Fruit narrowly ovoid, 6.5–8 × 3.5–4.2 mm, glabrous; dorsal ribs indistinct, lateral ribs winged, wings ca. 1/3 width of body, thin; vittae 1–3 in each furrow, 4–6 on commissure. Fl. and fr. Jun–Sep.
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