Coarse biennial herb up to 3 m tall; stems immaculate. Leaf pinnules cut nearly to midrib, lobes narrowly elliptic or linear, generally sharply acute, margins with a few sharp serrations. Umbels usually obconic in outline when dry, ±20-35 mm across at anthesis. Umbellules (5-)9(-11), ±5-8 mm across at anthesis. Bracteoles mostly 3-4, 1 or 2 often much reduced, largest ±1.5-4 x 0,5 mm, linear, free at base or occasionally very briefly united. Flowers white. Mericarps 5-6 x 2 mm, ± square or oblong in transverse section with 5 prominent ribs on outer face, pericarp greenish-brown, ribs pallid, smooth. Endosperm (in transverse section of ripe mericarp) smoothly suborbicular.
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