Erect or occasionally somewhat sprawling, sympodial, annual herb, 0.04-0.6 m tall. Stems herbaceous, immaculate, remaining simple or slightly or rarely well-branched at base; branches erect or ascending rarely somewhat decumbent, not sprouting from nodes. Leaves 15-90 x 10-35 mm, glabrous or scabrid, 2-pinnate, herbaceous to coriaceous; ultimate leaflet segments linear-oblong, 1-10 x < 1 mm, laminate to subterete, concolorous, green, margins entire, venation visible or obscure. Petioles 7-40 mm long, glabrous or scabrid. Umbels with peduncle short to long, (4)10-80 mm long; involucral bracts 1-6, lanceolate to ovate or often foliose, coriaceous, acuminate, margins usually membranous, glabrous or scabrid; rays 3 to 25, 10-50 mm long, glabrous or scabrid; involucel bracts 2 to 6, linear to lanceolate, coriaceous, acuminate, margins often membranous, glabrous or scabrid; raylets 4 to 12, 2-10 mm long, glabrous or scabrid. Flowers with petals 0.7-1 x 0.7-1 mm, deeply emarginate, papillose; ovary almost glabrous or scabrid to densely pilose; styles lengthening as fruit matures, 0.3-1.0 mm long, becoming reflexed and extending usually beyond base of stylopodium, rarely just up to base of stylopodium. Fruit 1.0-2.0 x 1.0-1.8 mm, elliptic to broadly ovate (not broader than long) in lateral view, base obtuse to slightly cordate; mericarps homomorphic, almost glabrous or scabrid to densely pilose; median and lateral ribs as well developed as marginal ribs, slightly prominent, cartilaginous, dorsal surface without fibrous ridges, slightly scabrid to densely pilose; marginal ribs parallel to very slightly concave in lateral view.
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Erect or occasionally ± sprawling annual, up to 0.6 m tall. Leaves finely dissected, herbaceous to leathery, leaflets linear-oblong. Umbels leaf-opposed, involucel bracts leathery, some often leaf-like. Flowers white. Fruit elliptic to broadly ovate, mericarps isodiametric, ribbed, marginal ribs parallel to very slightly concave in lateral view, scabrous to densely pilose, homomorphic, vittae present, rib oil ducts inconspicuous.
Erect or occasionally sprawling annual to 60 cm. Leaves finely dissected, soft to leathery, leaflets linear-oblong. Flowers in compound umbels on leaf-opposed peduncles, white. Fruit elliptic to broadly ovate, < 2.5 mm long, mericarps isodiametric, ribbed, marginal ribs parallel to slightly concave in side view, scabrous to densely pilose, vittae present, rib oil ducts inconspicuous.
Annual, up to 0.45 m high, branching from below. Leaves finely dissected, leaflets linear-filiform. Flowers in compound umbels on leaf-opposed peduncles, white; involucre of a few, narrow bracts. Flowering time Sept.-Jan. Fruit ovate and ridged, fruit and pedicels often hispid.
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