Erect, annual herb, 0.1-0.35 m tall, pilose. Cotyledons simple, narrowly oblanceolate, 15 mm 9 2 mm, margins entire. Stem solitary, dichotomously branched. Leaves cauline, 10-37 9 7-26 mm, first leaves tri-lobed, upper leaves digitately compound. Petioles 5-18 mm long, sheathing slightly at the base. Pinnae 12-24 mm 9 5-13 mm, 2-or 3-lobed; lobes linear-oblong to narrowly oblong, 5-12 mm 9 1-2 mm, flat, apex acute, margins and venation pilose, venation pinnate. Umbels compound, sparse, axillary, sessile (peduncle absent, rays arising directly from each node); involucre present; bracts 2, 2-4 mm long, becoming prominently recurved, lanceolate, apex acute, pilose; rays 2 to 4, unequal in length, with at least one remaining markedly shorter, longer rays 11-31 mm long and shorter ray 3-10 mm long at anthesis, pilose; involucel present; bracteoles 2, 1-2 mm long, becoming prominently recurved, lanceolate, apex acute, pilose; umbellate rays 2 to 4, short, less than 1 mm long at anthesis, pilose. Flowers subsessile, pentamerous, hermaphroditic; sepals obsolete; petals yellow, 0.6-0.7 mm long, ovate to obovate, tips not inflexed, acute, septum absent on inner face, pilose on the dorsal surface; stamens with anthers highly inflexed, small, 0.2-0.4 mm tall; ovary densely pilose, stylopodium flat; styles erect, very short. Fruit isodiametric, oblong, 2.5-3.0 mm 9 ±1.5 mm broad; mericarps homomorphic, distinctly pilose; median, lateral and marginal ribs 5, equal, prominent; commissural vittae 2; vallecular vittae 4; commissure very narrow; carpophore bifid for the upper two-thirds of its length, persisting partly on the plant.
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Small, erect, annual herb, 0.10-0.35 m high, sparsely to densely hairy. Leaves slender, long-petiolate, ternately dissected, lobes 2-or 3-fid, linear-oblong, acute, margins entire. Inflorescences: umbels sessile, axillary. Rays 2-4, unequal. Involucral bracts 2, 2-4 mm long, narrowly ovate. Umbellules 2-4-flowered. Petals very small, white, apices not inflexed. Stamens remain highly inflexed, appearing almost sessile. Flowering time Sept., Oct. Fruit narrowly oblong, with prominent ridges, sparsely to densely pilose; mericarps with blunt ridges; vittae 6, 1 in each furrow and 2 on face; carpophore bifid for the upper 2/3 of its length.
Shortly hairy annual to 25 cm. Leaves 2-or 3-digitate, leaflets oblong. Umbels compound, axillary, sessile, 2-4 rayed, rays distinctly unequal in length. Flowers yellow, petals with tips not inflexed. Fruit oblong, mericarps isodiametric, ribbed, hairy, carpophore bifid, one half of which persists on the plant, vittae present, rib oil ducts inconspicuous.
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