Perennial rhizomatous herbs, erect or stem climbers. Rhizome short, bearing many thick roots, usually cylindric, entire or branching, with chaffy elliptic or lanceolate scales. Indumentum absent. Stems 5–7(–20) arising from a single rhizome, terete, diam. not more than 5 mm. Leaves simple, 3–7-veined, shape variable; petioles with pulvinii at bases only, terete, shallowly ridged, channelled above. Inflorescence a distichous, overlapping cluster of scales with flowers solitary or in small fascicles, on slender, terete, erect or ascending pedicels inserted between the scales; flowers hermaphrodite, tepals in two whorls of 3, elliptic to elliptic-ovate, apex acute to acuminate. Stamens 6, free, inserted on a flat, discoid torus, anthers on short filaments; connective expanded apically above thecae, and also laterally so that thecae are separated on two lateral wings, divided by a ± pronounced median adaxial ridge; anthers curved in towards style, lateral margins touching, and apices growing between adjacent stigma branches, encaging the style; thecae introrse. Ovaries uni- or trilocular, ovate to elliptic-ovate in outline, with 3 shallow ridges; ovules 1 or 6; styles fused towards bases, with three free, bifid, recurved lobes towards apex. Fruits indehiscent, dry to somewhat fleshy, with 3 wings, obovate to broadly elliptic or rhomboid in outline, often narrowing towards bases and apices. Seeds 1–6, relased by the fruit walls breaking up irregularly, wingless, ruminate.
Two species, one endemic to eastern Madagascar, the other found in South India and Sri Lanka to northern peninsular Malaysia and southern Thailand. Both are plants of evergreen forests with relatively high rainfall.