Stems twining, thin, slender, sparsely pubescent or glabrous. Leaves ovate, 8-15 by 4-7½ cm, base deeply cordate, apex acuminate, with long and narrow, obtuse or acutish, mucronulate acumen, sparsely and minutely pubescent on both sides, more densely on the nerves beneath, or nearly glabrous; lower surface reddish; nerves 7-10 on either side of the midrib; petiole 4-7 cm. Inflorescences axillary, 1-2-flowered; peduncle thin, 2-5 cm long, sparsely pubescent or nearly glabrous. Pedicels longer than the calyx, slender, 15-30 mm. Bracts minute, caducous. Sepals subequal, 9-11 mm long, the outer ones orbicular to broadly elliptic, rounded at the apex, sparsely pubescent outside, shortly ciliate in the upper part; interior ones broadly elliptic. Corolla funnel-shaped, probably 6-8 cm long; midpetaline bands sparsely pilose outside and with minute black glands, or glabrous. Capsule unknown.
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