Description

Key Characters:

Growth Form: Annual, slender, erect or spreading herbs.

Stems: Caulescent, branched, glabrous.

Roots: Taproots slender.

Leaves: Leaves compound (ternately or ternate–pinnately decompound). Alternate. Blades with ultimate divisions linear to filiform. Margins highly dissected. Petioles sheathing. Stipules absent.

Flowers: Flowers in loose compound umbrels. Peduncles terminal and axillary, exceeding the leaves, involucre ± absent, rays few, erect to divaricate, pedicels few, spreading, or some of the flowers sessile, involucel of a few linear bractlets usually shorter than the pedicels. Flowers bisexual (perfect). Calyx (sepals) absent. Corolla of 5 petals; petals white, oblong to ovate, without an inflexed apex. Stamens 5, inserted on an epigynous disk. Ovary inferior, 2-celled; ovules 1 per cells, anatropous; styles 2, usually swollen at base into a stylopodium. Styles very short, the stylopodium low-conical; carpophore 2-cleft at apex.

Fruit: Fruit ovoid; flattened laterally and slightly constricted at the commissure; smooth; tuberculate; or echinate; ribs filiform; rounded; vittae 1–3 in the intervals; 2 on the commissure. Seeds 1 per mericarp; embryo small; endosperm cartilaginous. seeds subterete in cross section; the face sulcate.

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