Stems twining, 60-500 cm, branched. Leaves on main stems and major branches alternate or subopposite, those on branchlets opposite or pseudoverticillate; petiole 0.7-1.5 cm; blade ovate, lanceolate, or elliptic, 0.5-3.5 × 0.5-1.5 cm, both surfaces glabrous, base cuneate or rounded, margin entire, apex acuminate, acute, or slightly obtuse. Flowers solitary, terminal; pedicels 4-5 cm. Calyx tube adnate to ovary only up to middle; lobes lanceolate or narrowly oblong, 2-2.8 × 0.3-0.6 cm, subentire, apex acute or slightly obtuse. Corolla pale green or greenish yellow, with brown-red or purple reticulate markings, campanulate, 3.3-5.8 × 3-5 cm; tube 2-3.5 cm; lobes deltoid, 1.2-1.8 × 1.2-2 cm, acute. Filaments slightly dilated at base, 6-13 mm; anthers elongate, 4-7 mm.
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