Plants 1–1.5 m. Stem slender, paniculate-branched, lower branches alternate, upper branches verticillate. Basal leaves long-petiolate; blade broadly rhombic, ternate-3-pinnatisect; ultimate segments oblong or ovate-oblong, 8–15(–30) × 3–5 (–10) mm, usually pinnatisect, lobules linear, entire, adaxially glabrous, abaxially sparsely hispid. Upper leaves bladeless, sheaths lanceolate. Terminal umbel sessile or short-pedunculate, lateral umbels 2–4, opposite or verticillate, rarely single, exceeding terminal; umbels 5–10 cm across; bracts lanceolate; rays 10–20(–25), subequal, very spreading; bracteoles 5–7, lanceolate, persistent; umbellules 8–16-flowered. Stylopodium low-conic, base dilated; style elongate, very reflexed when mature. Fruit ellipsoid, ca. 8 mm; vittae 1 in each furrow, 2 on commissure. Fl. and fr. Jun–Jul.
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