Description

Key Characters:

Growth Form: Annual, erect or decumbent herbs.

Stems: Caulescent, branched, glabrous. stem branched, hispid or pubescent.

Roots: Taproots slender.

Leaves: Leaves compound (1–2 times pinnately compound or pinnately decompound). Alternate. The ultimate divisions narrow. Petioles sheathing. Stipules absent.

Flowers: Flowers in capitate or loose, compound, lateral or terminal and lateral, sessile or pedunculate umbels. Involucre of a few small bracts or absent, involucel of several linear or filiform bractlets. Flowers bisexual (perfect). Calyx teeth minute or absent, rarely conspicuous. Corolla of 5 petals; petals white, obovate, with a narrower 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 short, the stylopodium conical, carpophore bifid at apex or cleftf ⅓–½ its length.

Fruit: Fruit ovoid or oblong; flattened laterally; tuberculate or prickly; vittae solitary under the secondary ribs; 2 on the commissure. Seeds 1 per mericarp; embryo small; endosperm cartilaginous. seed face concave to shallowly sulcate.

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