Robust perennial climber, 3-8 (up to 20?) m high. Stem angular, glabrous. Leaflets in 3 or sometimes 2 pairs, glabrous, obtuse or acute, mucronate; lowest pair subsessile, not stipuliform, oblong-obovate from an obtuse, truncate or emarginate, subequal, often broadened base; higher ones distinctly stalked, ovate to oval or oblong from an obtuse, acute or contracted base, 3½-13 by 1¼-6 cm; lateral nerves confluent into a thin intramarginal nerve; petiolules 1-2 cm. Flowers patent or erecto-patent. Peduncle robust, 8-30 cm long, near the base with 2 pinnate bracts. Calyx 3-3½ cm long, cleft more than halfway down, widely gaping; tube 1-1½ cm long, very wide, with 5 strongly prominent flat folds; segments folia-ceous, slightly or hardly longer than broad, broadly oval-ovate, rounded or retuse, with a short or longish point, green, pale-veined, glabrous without, very densely short-white-pubescent within. Corolla 4½-6½ cm long, very wide, lobed much less than halfway down, at first pale green, usually turning darkviolet, rarely not changing its colour; tube slightly constricted above the broad campanulate base, above the constriction gradually widened, outside along the upper margin densely short-pubescent, otherwise glabrous, within with a broad densely villous ring at the insertion of the stamens, otherwise glabrous; segments broadly triangular, rounded or very obtuse. Stamens about as long as the corolla or slightly or distinctly longer, often upturned at the apex, filaments glabrous above the pubescent base; style glabrous; style-arms comparatively short, erect or erecto-patent. Capsule elliptic-oblong, 5-9 cm long. Seeds numerous, blackish brown, ± 1½ cmlong.
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Glabrous or almost glabrous, vigorous, perennial liane. Leaflets usually in 3 pairs, including basal pair, petiolulate; tendrils branched and becoming woody towards base, purplish when young. Lamina 4-12 × 2-5.5 cm, elliptic to obovate, entire; base cuneate to rounded, sometimes asymmetric; apex acute or mucronate. Calyx accrescent, 3-4 × 1.7-2.7 cm; lobes broadly oblong or oblong-ovate to almost orbicular, glaucous, often purple-tinged where exposed to sunlight, mucronate; margins strongly undulate. Corolla 6-7 cm long, deeply campanulate, green, becoming purple after anthesis; tube c. 3 cm wide; lobes 1.5-2 cm long, broad and rounded. Filaments slender, with basal woolly tuft; anthers 10-12 mm long, linear. Capsule (3)-5.5-8.5 cm long, ± ellipsoid; valves 2-3 cm wide. Seed 1-1.5 cm long including narrow wing, broad-or oblong-ovoid.
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