Plants (8–)15–30 cm. Stem (0.5–)1–2.5(–3) cm thick. Petioles 2–10 cm, slender, sheaths narrow-oblong, 3–6 × 1–1.5 cm; blade ovate-oblong or oblong, 4–7 × 2.5–7 cm; pinnae 5–6 pairs, proximal pinnae short-petiolulate; ultimate segments linear, 1–4 × 0.5–2 mm, apex rounded, entire or 2–3-toothed. Primary umbels (3–)6–16 cm across; bracts 1–4 cm, about half as long as rays; rays 15–35(–50), 2–9 cm, subequal, suberect-ascending, hollow and ribbed; pedicels 2–7 mm, membranous-winged. Calyx teeth 0.4–0.8 mm, persistent in fruit. Petals 2–2.5 × 1.2–1.5 mm. Anthers dark purple. Styles 1.5–2 mm. Fruit ca. 4 × 1.5 mm. Fl. May–Sep, fr. Jul–Oct.
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