Climber with twining stems, glabrous except for inflorescence; latex clear. Leaves thin, soft, pale green; petiole slender, 12–30 mm long; lamina elliptic, 8–15 cm long, 3.4–8.2 cm wide, cuneate, attenuate or occasionally rounded at base, shortly acuminate or mucronate; secondary veins 6 or 7 pairs, curving, slightly raised below, with some fine tertiary veins visible. Inflorescence of axillary, open panicles, with 13–30 flowers, usually longer than leaves; axes finely hairy; pedicels 4–9 mm long. Calyx lobes 2 mm long, finely hairy. Corolla yellowish or green, abruptly expanded above apex of tube, glabrous externally or very minutely puberulous; tube 2.5–4 mm long, with a ring of very short, flattened hairs in throat; lobes widely spreading, narrowly oblong-lanceolate, 5–6.3 mm long, 1.5–1.8 mm wide, obtuse, glabrous internally. Anther cone 3.3–4 mm long, ± fully exserted; filaments spirally twisted; anther tails convergent. Nectary scales free, ovate-deltoid, c. 1.2 mm long. Capsules slender, narrowly fusiform, 10–18 cm long, 0.5–0.9 cm diam.
Lianas woody, to 10 m, glabrous except for inflorescences. Branches pale gray. Petiole 2-4 cm; leaf blade ovate or subelliptic, 4-12 X 3-7.5 cm, base cuneate to shallowly cordate; lateral veins 5-7 pairs. Cymes 8-15 X 8-11 cm; peduncle 3-9 cm. Sepals ca. 2 mm, glands broadly triangular, membranous. Corolla white or greenish, tube ca. 5 mm, limb 1-2 cm wide, lobes ca. 6 mm. Anthers ca. 3.5 0.6 mm, inserted at middle of corolla tube. Ovary as long as or slightly shorter than disc, glabrous. Follicles 2, linear-cylindric, parallel, 7-16 X 1-2 cm. Seeds oblong 1.5-1.8 cm X ca. 2 mm, coma 2-4.5 cm. Fl. Apr-Oct, fr. Sep-Dec.
A woody vine. It can be 10 m long. The branches are pale grey. The leaves are 9-15 cm long by 5-9 cm wide. The flowers are 10-13 mm across. The fruiting carpels are 10-18 cm long by 0.5-0.9 cm wide.