An erect, divaricately branched perennial herb. Stem 5-6-angled, glabrous. Leaves opposite, or in whorls of 3, oblong,-ovate, tapering at base, subacute at apex, marginsentire, glabrous. Flowers small, in axillary whorls or slender pedicles. Corolla white.Fruits subglobose, 3-4- in. diameter. (India) Herb (Laos) Annual herbaceous plant, 40 - 70cm high. Stems woody at the base, much-branched,quadrangular when young. Leaves small, 3 -verticillate or opposite, coarsely toothed-serrrate. Flowers white, crowded in the axil of the leaves. Capsule small, globose,many-seeded (Vietnam)