Tuberous herb; vertical stolon 5–7 cm long. Stem climbing, to 1.5 m long, glabrous; linear-subulate prophylls at base. Leaves in alternate groups of 3; lamina orbicular to slightly reniform, concave, 3–4 mm diam., peltate, on slender deflexed petioles, the median 4–5 cm long, the laterals 1–2 cm long. Inflorescence paniculate, terminal; flowers many; pedicels 3–8 mm long. Sepals ovate, 4–5 mm long, glandular on and near margins, dorsally glabrous or almost so. Petals obovate, 8–12 mm long, white. Styles 3, divided from base into many simple, slender segments, 1–3 mm long.