Somewhat erect or rarely sprawling, sympodial, annual herbs, 0.15-0.5 m tall. Stems herbaceous, immaculate, slightly to well-branched at base; branches ascending to erect, not sprouting from nodes. Leaves 40-120 x 30-50 mm, 2-pinnate, herbaceous; ultimate leaflet segments narrowly oblong to oblong, 7-12 x 2-3 mm, laminate, concolorous or discolorous and green above and green or glaucous beneath, margins entire, venation visible. Petioles 15-60 mm long, slightly scabrid, green. Umbels sometimes sessile or usually pedunculate, peduncle. 0-65 mm long; involucral bracts 0(1), lanceolate, coriaceous, acuminate, margins membranous, glabrous; rays 3 to 8, 5-20 mm long, scabrid; involucel bracts (1)2 to 4, linear to lanceolate, coriaceous, acute, margins sometimes membranous, glabrous; raylets 4 to 12, 2-5 mm long, scabrid. Flowers with petals 0.5-0.7 x 0.4-0.6 mm, deeply emarginate, papillose; ovary scabrid; styles usually lengthening as fruit matures, 0.4-0.8 mm long, becoming reflexed and extending up to or more commonly beyond base of stylopodium. Fruit 1.6-2.0 x 1.6-2.0 mm, broadly elliptic to rotund in lateral view, base obtuse; mericarps homomorphic; median and lateral ribs as well developed as marginal ribs, prominent, cartilaginous, dorsal surface with fibrous ridges, glabrous; marginal ribs parallel to very slightly concave in lateral view.
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Annual, up to 0.3 m high. Leaves dissected, leaflets narrowly ovate. Flowers on scabrid pedicels, white; involucre of a few, narrow bracts. Flowering time Nov., Dec. Fruit ovate and ridged, glabrous; mericarps with 5 ribs, flat on face, or channelled, convex on back; vittae 6, 1 in each furrow and 2 on face.
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