Twining glabrous herbaceous climber with tuberous root, glabrous stems green with reddish tinge. Mainly glabrous leaves to 30mm x 8mm with a few recurved hairs along margins. Extra-axillary usually 1-flowered inflorescence with a bract 1mm long. Sepals appressed to corolla tube to 1mm long, glabrous corolla to 35mm long opening to 8mm wide, whitish-green tube with purplish bulges, tube glabrous except for a ring of hairs around mouth, erect corolla lobes to 10mm x 7mm, green above, purple-black beneath.