A woody quite glabrous twiner. Branches terete, solid or fistulose, greyish brown, warty by pale lenticels. Leaves ovate to broadly ovate, 7-13 by 3½-9 cm, cordate at the base, attenuate or slightly acuminate towards the obtuse or acutish apex; margin entire or slightly undulate; midrib and 8-10 curved lateral nerves on either side impressed above, prominent beneath; secondary nerves parallel, like the reticulate tertiary ones slightly impressed above, prominulous beneath; petiole narrowly sulcate above, 1½-5 cm long. Inflorescences axillary, up to 20-30 cm long, widely corymbosely branched, many-flowered; lower branches in the axils of small caducous leaves, upper ones in the axils of minute bracts. Peduncle 7-11 (-17) cm, terete. Pedicels up to 15 mm, slightly angular. Flower-buds conical, acute. Sepals sub-equal in length, 11-12 mm long, the two outer ones elliptic, rounded and mucronulate at the apex, concave, subcoriaceous; 3 inner ones broadly elliptic to orbicular, rounded and mucronulate at the apex, and with membranous margins. Corolla funnel-shaped, ca 2-2½ cm long, glabrous, the limb shallowly lobed. Filaments papillose at the margins of the dilated base. Ovary glabrous.
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