Succulent glabrous perennials with prostrate stems to 2 m long, rooting at nodes. Leaves triquetrous, opposite, connate, ensheathing stem; keel acute, smooth or denticulate, often denticulate only on upturned part. Flowers solitary, on short shoots in axils, sessile or pedicellate. Sepals 5, 2 large and opposite, 3 smaller with broad membranous margins. Petal-like staminodes many, yellow, pink, purple or white; stamens many. Styles 6–14, free or shortly fused at base; ovary inferior; locules 6–14; placentation parietal. Fruit indehiscent, fleshy. Seeds many, ovate, elliptic or oblong, laterally compressed, mucilaginous, light to dark brown.
Prostrate perennial succulent herbs; stems trailing. Lvs opposite, sessile, united at base, sharply 3-angled, smooth, bitter-tasting. Fls solitary, terminal, ebracteate. Sepals 5, sharply 3-angled: 2 large, denticulate on keels, 3 smaller with expanded membranous margins. Petals numerous, > sepals, free; stamens numerous; staminodes 0. Placentation parietal. Stigmas 8-16, plumose. Fr. indehiscent, fleshy, mucilaginous; locules as many as stigmas. Seeds slightly compressed, obovoid, smooth.