Annual, glabrous to pubescent herbs; stems slender, erect, dichotomously branched, the leaves opposite, petiolate, simple, crenate-dentate, the petiole with lacerate, scarious, adnate stipules setulose-hairy at apex; inflorescence of simple, pedunculate, paniculately arranged, axillary and terminal umbels, the involucre of several small bracts; rays spreading-ascending; flowers white or greenish-white, the petals with a short inflexed apex, the calyx prominent; stylopodium depressed-conical, the styles short, the carpophore entire; fruit flattened dorsally and constricted at the commissure, the ribs filiform, the vittae minute or wanting; seed flattened dorsally, its face plane.
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