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Rootstock producing a tuber. Tuber becoming rather large, subglobose or oblong, dark brown. Stems annual, slender, over 0.3 m long, climbing-twining, branching. Leaves shortly petiolate, broadly ovate-cordate to oblong or lanceolate, up to ±25 mm long, fleshy, glabrous or sometimes pubescent, variegated. Flowers in 1-few-flowered pedunculate cymes; peduncles and pedicels 5-8 mm long. Sepals ± linear-lanceolate, ±2 mm long. Corolla acuminate in bud, 23-35 mm long; tube with globose base, cylindric above, 1.5-2.0 mm diam., slightly curved, expanded to a trumpet-like mouth; lobes 10-15 mm long, not much shorter than tube in typical form, united at tips, linear, replicate, forming an open lattice-work-like cage, glabrous in typical form, sometimes finely pubescent. Corona subcampanulate, 5-fluted in type, or cupular; inner lobes confluent with outer tube, incumbent-erect-spreading or linear-falcate, acute.
A herb. The rootstock produces a tuber. It is large, oblong and dark brown. The stems are slender and grow each year. They are 30 cm long. They are twining and branching. The leaves are broadly oval to hart shaped and fleshy. The flowers are in small groups. They are yellowish white with brown stripes.
