A climbing perfectly glabrous shrub, with long very slender tendrils; branches very slender, terete, green, at length pale brown, lenticels very scattered, inconspicuous. Leaves lanceolate to oblong-lanceolate, acuminate (acumen 4–8 lin. long, subacute or obtuse), minutely cordate at the base, 3–4 in. long, 1 1/4–1 1/2 in. broad, thin-papery; midrib very slightly convex above, much more so below; secondary nerves 7–9 on each side, very slender, oblique, connected by faint arches, like the loose veins very faintly raised on both sides; petioles up to 1 1/2 lin. long, rather broad at the base. Flowers solitary (always?) in the leaf-axils, subsessile; bracts about 6, gradually increasing upwards, ovate, sparingly ciliolate. Calyx 1 lin. long, green; sepals 5, ovate, obtuse, sparingly and minutely ciliolate. Corolla glabrous on both sides, 5 lin. long in bud, greenish; tube urceolate-campanulate, shortly exserted from the calyx; lobes linear, obtuse, 4 lin. long. Stamens inserted below the middle of the corolla-tube; filaments very short; anthers erect, ovate-lanceolate reaching to the corolla-mouth. Ovary oblong-conic, very minutely hairy; style extremely short; stigma conical.