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Leaf lamina ovate or triangular, rarely narrowly hastate, 5–13·5 × 3·5–11 cm., acute, acuminate, obtuse or emarginate at the apex, cordate or with rounded basal lobes and a narrow or wide sinus at the base, entire, membranous, dark glossy green; petiole slender up to 8 cm. long.
Sepals imbricate, ovate-elliptic, 1·3–1·7 cm. long, more or less rounded at the base, acute or rounded at the mucronulate apex, rugulose, with veins showing obliquely in the hyaline margins.
Corolla funnel-shaped, white lilac or pinkish with darker centre, with a more or less cylindrical tube, 5–8 cm. long, possibly glutinous judging by the appearance of the dried flowers.
Flowers in few-many-flowered cymes, very lax, rarely solitary; peduncle 2–11 cm. long; pedicels and secondary peduncles 1·5–3 cm. long; bracts minute.
Stems ridged, up to 6 m. long, woody with a much-wrinkled surface, often yellowish.
Capsule globose, coriaceous, glabrous, tipped by the persistent style.
Seeds trigonous, blackish, glabrous or puberulous.
Glabrous perennial liane.
