(rarely 3-foliolate), sometimes cirrhose; leaflets narrowly elliptic, acute, cuneate at base, 5.5-15 cm long and 2.0-7.1 cm wide, membranaceous, secondary veins 5-8 on a side, densely lepidote-papillose with scattered, often deciduous, lepidote scales, puberulous on the midvein above, otherwise glabrous, drying olive, con-colorous; tendril simple, 8-17 cm long; petiolules 0.3-2 cm long, petiole 0.7-3.4 cm long, puberulous on the upper surface. Inflorescence an axillary raceme, often reduced to 3 flowers or a single flower in the leaf axil, the peduncle and pedicels glabrous or inconspicuously lepidote. Flowers with a sweet aroma, calyx cupular, truncate, 7-12 mm long and 7-10 mm wide, inconspicuously lepidote to essentially glabrous, inconspicuously ciliate on the margin, usually with submarginal plate-shaped glands, corolla lobes cream-colored, the tube yellow outside, inside yellow with a longitudinal orange stripe below each of the lower 4 sinuses, tubular-campanulate above a narrowed base, 6.2-10.3 cm long and 1.1-2.2 cm wide at the mouth of tube, the tube 4.3-7.5 cm long, the lobes 1.1-2.0 cm long, glabrous outside, inside glandular-lepidote on the lobes, mostly glabrous in the tube, pu-bescent with simple trichomes at the level of stamen insertion; stamens didyn-amous, the anther thecae divergent, 3.5-4.5 cm long, the longer filaments 2.3-3.1 cm long, the shorter filaments 1.6-2.1 cm long, the staminode 3-6 mm long; in-serted (2.4-)2.7-3.1 mm from base of corolla tube; pistil 5.1-5.6 cm long, the ovary rounded-cylindric, 2.0-2.5 mm long and 2.0-2.5 mm wide, 1.5-2.0 mm thick, densely lepidote, the ovules 4-seriate in each locule; disc conical-pulvinate, 3-4 mm long, 3-4 mm wide at base, 1.5 mm wide at top. Capsule elliptic, com-pressed, acute, 6.2-12.2 cm long and 2.9-6 cm wide, on a stipe 1-1.2 cm long, drying yellow-brown, the surface slightly and inconspicuously lepidote, appearing rough and varnished under a lens, the calyx persistent; seeds 1.4-1.8 cm long and 1.9-2.4 cm wide, woody, somewhat flattened, essentially wingless, the hilum large, elliptic, to 3 mm by 7 mm.
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Liana to at least 2.5 cm in diameter, usually less than 1 cm in diameter, the bark smooth, finely longitudinally ridged; stem with 8 phloem arms in cross sec-tion; branchlets subterete, longitudinally striate when dry, mostly glabrous, the nodes puberulous, without interpetiolar glandular fields; pseudostipules foli-aceous, 4 at each node, 3-13 mm long, 1.5-10.0 mm wide. Leaves 2-foliolate