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Slender scaberulous climber; tuber 10–25 x 5–10 cm; aerial stems annual or perennial, twining, up to 1.5 m long. Leaves opposite; petiole c. 3 mm long; blade narrowly obovate to obovate, 20–95 x 12–35 mm, dull green, dotted, with ± recurved, acute to obtuse and mucronate tip, cuneate at the base. Inflorescences axillary and terminal, lax, paniculate, with 3–5 monochasial branches of c. 5 flowers each; peduncles 2–14 mm long; pedicels 1–3 mm long. Sepals 1–1.2 x 0.6–0.7 mm, ± narrowly triangular. Corolla glabrous; tube 1.7–2 mm long, campanulate; lobes spreading, 1.7–2 x 0.8–1 mm, obovate, obtuse, dark violet, violet, magenta or mottled green. Corona-lobes c. 1.5 mm long, ligulate with 3- or 5-fid tips, connivent over gynostegium, white to greenish-white or pale green. Follicles very narrowly ovoid with tapering tip, 60 x 8 mm, glabrous or sparsely scaberulous, brown.