A twining liana equipped with tendrils. Stem 0.3-0.5 cm or more in diameter, without exudate, smooth to slightly fissured; outer bark beige; inner bark brown. Tendrils woody, hooked or circinnately coiled, greenish turning beige, always in pair, the pairs of tendrils originating from a common stalk arising from lateral branches. Leaves alternately arranged, simple, entire, broadly ovate, bilobed, apex of each lobe acuminate, base cordate 6.8-12.4 cm long, 7.5-12.5 cm broad, glabrous except for the ferruginous pubescent veins on the lower surface; petiole 5-8 cm long, 0.05-0.1 cm in diameter, hairy and swollen at both ends, venation palmately netted, actindromous with 9 prominent nerves. Inflorescence in dense panicles composed of racemes, with a ferruginous pubescent axis. Flowers bisexual; calyx splitting into 2 (or 3) reflexed lobes; petals obovate with crenulate margin, 8-15 mm, orange turning red, outside densely rusty hirsute; stamens 3, fertile; filaments filiform, hairy base, shorter than petals; anthers ellipsoid, 3mm long; staminodes 2, minute; ovary appressed pubescent; style pubescent to sparsely hairy towards the stigma; stigma capitate. Fruit a pod, 2o cm long, elongated with tapering ends. Seed 5-8 flattened, ovate-orbicular, 2 cm in diameter.