Plants 20–50 cm high. Basal leaves short petiolate, petiole 0.5–1.5 cm, upper leaves sessile; blade ultimate segments of blade oblong to linear, 2–15 × 1–2 mm. Umbels 5–10 cm wide; bracts several, narrowly lanceolate, ca. 5 mm; rays 8–16, 1–5 cm, unequal; bracteoles 8–10, linear-lanceolate, 1–4 mm, margin scarious; umbellules with 6–14 bisexual flowers and several staminate flowers; pedicels unequal, the peripheral ca. 1 cm, the internal almost obsolete. Calyx teeth ca. 0.5 mm. Fruit with many brownish longitudinal stripes, 2–3 × 2.4–4 mm. Fl. May, fr. Jun.