Annual to 60 cm high. Basal leaves ternate or 1(–2)-pinnate, 2–20 cm long, 1.5–5 cm wide; segments elliptic to ovate, dentate to deeply incised. Upper leaves dissimilar to basal leaves, 2–3-pinnate or pinnatisect; segments linear, entire. Peduncle 2–10 cm long; rays 2–6, to 2.5 cm long; bracteoles 2–5; umbellules with 6–16 bisexual flowers and up to 6 smaller male flowers; pedicels 2–5 mm long. Sepals ovate-deltoid or ovate-lanceolate, 0.2–2 mm long, unequal; petals white, 11–14 mm long or 32–42 mm long when enlarged on peripheral flowers. Fruit c. 4–5 mm long; mericarps remaining united. Flowers early spring to early summer.
Wim. Commonly cultivated for its use as a culinary herb and rarely recorded in Victorian pastures as a result of contamination of crop seed. Native to the Mediterranean region.
