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.