Plants 40–100 cm high. Tuber ca. 2 cm wide. Basal and lower leaves long-petiolate with a small, narrow sheath; blade broadly rhombic-ovate in outline, to 8 × 5 cm; primary pinnae 4–5 pairs, long-petiolulate; ultimate segments linear-oblong, 3–10 × 0.5–2 mm, entire. Middle and upper leaves gradually reduced with petioles wholly sheathing. Umbels 3–4 cm wide; bracts 1 or 2, or absent; rays 5–8; bracteoles 5, lanceolate or ovate-lanceolate, reflexed in fruit. Pedicels numerous, ca. 5 mm. Petals white, up to 5 mm (the outer petals radiating). Fruit dark brown, ovoid-oblong, 3–5 × 1.5–1.8 mm. Fl. Apr–May, fr. May–Jun.
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