Plants 16–100 cm. Roots 8–18 × 0.8–2 cm. Stem smooth, lower parts deep purple. Leaves triangular-ovate in outline, 8–25 × 6–20 cm; petioles 10–23 cm; ultimate segments linear, 4–20 × 2–6 mm, glaucescent, petioles and margins occasionally squamose-pubescent. Umbels 3–16 cm across; peduncles stout; bracts absent; rays 4–14, 1–4 cm, unequal; umbellules 8–12-flowered; pedicels 4–8 mm, subequal. Fruit ellipsoid, ca. 4 × 2.5 mm, dark brown; ribs gray-yellow. Seed face deeply sulcate. Fl. Jul–Aug, fr. Sep–Oct.
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