Plants 25–75 cm. Taproot slender. Stem purplish, branched. Lower leaves long-petiolate, petioles slender, sheaths narrow-oblong; blade broadly ovate, 3–10 × 2–6 cm, 3-pinnate; lower pinnae short petiolulate; ultimate segments linear-lanceolate, 3–8(–10) × ca. 1 mm, pinnatifid. Umbels 3.5–10 cm across; peduncles 3–12 cm; bracts and bracteoles absent; rays 5–11, 2.5–6 cm; umbellules many-flowered. Calyx teeth minute, ovate-triangular or semi-orbicular. Petals obovate, white or pinkish, notched with incurved tips. Fruit oblong-ellipsoid, ca. 2 × 1.3 mm; ribs filiform. Fl. Aug–Sep, fr. Sep–Oct.
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