Coarse biennial herb, often less than 300 mm high under harsh conditions, up to 1 m in more favourable situations; stems immaculate. Leaf pinnules cut nearly to midrib, narrowly elliptic or linear, sharply acute, margins with a few sharp serrations. Umbels usually obconic in outline when dry, ±20-50 mm across at anthesis. Umbellules mostly 5-11, ±5-10 mm across at anthesis. Bracteoles 3-5(-6), some usually much reduced, largest 3-9 x 0.5-1 mm, linear, bases free. Flowers white. Mericarps ±5 x 2 mm, ± hemispherical in transverse section with 5 prominent ribs on outer face; pericarp greenish-brown, ribs pallid, ± smooth. Endosperm (in transverse section of ripe achene) smoothly suborbicular.
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