Tufted perennial, 20-30 cm tall (excluding inflorescence). Root slender, ? 4 mm diam., very slightly woody. Stem sympodial, slender, 2-4 mm wide, up to 450 mm long, slightly woody, subterranean, striate. Leaves rosulate, 140-550 mm long, annual, sclerophyllous, erect or reclining; petiole 100-240 mm long, twice as long as blade, terete, sheathing at base; blade 5-8 mm long, 3-to 4-pinnate, pinnae diverging at acute angles, rachis straight, pinnae segments 10-70 x 0.5-1.0 mm, erect or suberect, straight, slightly rigid, linear or linear-lanceolate, flat or sub-terete, mucronulate, glabrous. Synflorescence 300-450 mm long, with terminal primary umbel subtended by 0 to 4 smaller, secondary umbels, peduncle striate. Umbels compound, flat-topped; involucral bracts numerous, 5-9 mm long, lanceolate to narrowly ovate, acuminate, glabrous or sparsely scabrous; rays (5)9 to 12, 15-60 mm long at anthesis, unequal, sparsely scabrous; involucel bracteoles numerous, 3-4 mm long, lanceolate, acuminate, scabrous; raylets numerous, 2-4 mm long, scabrous. Flowers hermaphroditic in terminal umbels, functionally male in secondary umbels; sepals relatively large, acuminate, glabrous; petals cream-coloured, elliptic to obovate, acuminate, with inflexed tips, glabrous, secretory duct unbranched; stamens with tips inflexed; stylopodium broadly conical; styles short, elongating and often becoming reflexed in young fruit. Fruit dorsally compressed, broadly obovate, ±10 x 5 mm, base truncate, apex obtuse to slightly notched; mericarps homomorphic, median and lateral ribs clearly visible but not prominently raised, marginal ribs very broadly-winged, thick; commissural vittae 2, narrow; vallecular vittae 4, narrow; commissure very broad, wing tip to wing tip; carpophore bipartite.
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