Stems twining, terete, pale greyish brown, lenticellate; young parts appressed-pilose, soon glabrous. Leaves oblong to ovate-oblong, 5-12 by 1½-6 cm, obtuse or acutish at the base, attenuate towards the obtusish or acute, mucronulate apex, or slightly acuminate, glabrous above except for the midrib, sparsely appressed-pilose and glabrescent beneath (occasionally densely hairy beneath); nerves 5-8 on either side of the midrib; petiole 1½-5 cm. Peduncles axillary, 5-10 cm, sparsely appressed-pilose, lenticellate, cymosely branched at the apex, few-to several-flowered. Pedicels sparsely appressed-pilose, more densely so near their base (occasionally hairy over the whole length), 7-12 mm, in fruit up to 25 mm long, at that time nodding, and slightly curved at the base, gradually thickened towards the apex. Sepals subequal or outer ones a little shorter; two outer sepals oblong to ovate-oblong, 6-6½ mm long, sparsely appressed-pilose; sepal 3 ovate, 6-6.5 mm long, with one thin glabrous margin; two inner sepals broadly ovate to triangular, ca 1 mm long, with two glabrous margins. Corolla broadly funnel-shaped, white; limb subentire, ca 4½-5 cm diam.; midpetaline bands sericeous, connecting fields and basal portion of corolla glabrous. Filaments glandular-papillose throughout. Ovary glabrous, 2-celied. Fruit ellipsoid, up to 12 mm long, with 1 ellipsoid seed.
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