Deciduous geophyte. Roots replaced periodically, clustered, 1 to 3, pencil-like, slightly and evenly fleshy. Leaves in basal rosette, spreading, dead or dying at time of flowering, 150-300 x 40-100 mm, 2-to 4-ternate; rachis and pinnae straight. Ultimate leaflets 3-to 5-partite with lanceolate segments in first formed leaves but becoming 2-or 3-sect with linear segments in mature leaves; segments 5-75 mm x 0.5-1.5 mm, concolorous, glabrous; margins and midrib slightly thickened and extending into a sharp point. Synflorescences 0.4-0.8 m long, with terminal primary umbel subtended by 0 to 3 smaller, secondary and tertiary umbels; peduncle brownish, glabrous, nodes subtended by reduced scale-like peduncular bracts. Umbels compound, transversely ovate to usually obtriangular; involucral bracts 3 to 4, 3-5 mm long, oblong to lanceolate, acuminate, glabrous; rays 4 to 7, 15-90 mm long at anthesis, usually unequal, sub-erect to spreading, glabrous; involucel bracts 4 to 8, 1.5-2 mm long, oblong to broadly oblong, acuminate, glabrous, raylets 10 to 18, glabrous, 3-5 mm long at anthesis. Flowers hermaphroditic in terminal and secondary umbels, functionally male in tertiary umbels; calyx lobes 5, acute to tridentate; petals 5, yellow, broadly ovate to broadly elliptic, acuminate with tips inflexed, glabrous, resin duct conspicuously branched, lateral branches 2-5, arising from near the base of the central duct; stamens 5, with anthers inflexed; ovary bilocular, glabrous; stylopodium shortly conical; styles at first erect, later becoming reflexed to just above the base of the stylopodium. Fruits isodiametric, elliptic to narrowly ovate in dorsal view, 7.0-9.0 mm x 3.0-5.0 mm; mericarps homomorphic or heteromorphic, glabrous, immaculate when dry; median and lateral ribs 3, equal or ± unequal, very prominent to very narrowly winged; marginal ribs 2, broadly winged, straight, margins entire; vascular tissue at base of ribs only; ribs with most cells lignified; commissural vittae 2; vallecular vittae 4; commissure narrow; carpophore bipartite; druse crystals present, scattered throughout mesocarp.
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Perennial to 1 m, roots 1 or 2, fleshy. Leaves dead or dying at flowering, triternate, leaflets lanceolate to narrowly linear. Inflorescence with reduced sheath-like bracts at nodes, peduncle few branched with up to 3 lateral umbels, involucel bracts 1.5-2.0 mm long, terminal umbel 4-7-rayed, rays suberect to spreading. Flowers yellow, sepals acute to tridentate, petals with resin duct notably branched near base. Fruit narrowly obovate, 7-9 mm long, mericarps slightly dorsally compressed, marginally winged, dorsally prominently ribbed, homomorphic or slightly heteromorphic, vittae present, rib oil ducts inconspicuous.
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