Plants 30–100(–150) cm. Basal petioles ca. 20 cm, sheaths oblong; blade triangular-ovate, 8–15 × 4–8 cm, 3–4-ternate/ pinnate, held in one plane; ultimate segments linear-lanceolate, 2–5 × 1–3 mm, closely spaced, acute. Terminal umbels 5–8 cm across; bracts 1 to several, linear, 5–15 mm; rays 8–15, 3–5 cm, somewhat unequal; bracteoles 4–6, linear, 2–5 mm; umbellules 10–15-flowered; pedicels 2–12 mm, unequal. Calyx teeth lanceolate, 0.7–1.2 mm. Petals ca. 1.5 × 1 mm. Fruit ca. 2 × 1.5 mm. Fl. Jul–Sep, Fr. Aug–Oct.
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