Liane with main stems high-climbing, up to 10 cm. diam. or more at base, branching; branchlets stout, glab., grooved. Lvs 3-foliolate, on petioles c. 4 cm. × 2 mm. Lflts on stout petiolules c. 1-2 cm. long, dark green, coriac., glab., broadly ovate, cordate to truncate at base, to broad-oblong; (2.5)-5-10 × (1·5)-3-5 cm., entire to crenately toothed or lobed at apex. Subfloral lvs smaller. Infl. of axillary, us. ample, panicles; bracts ovate-acuminate, lower ones often foliaceous, petiolate, trifoliolate; pedicels rather stout, up to 4 cm. long, ± pubescent. Fls fragrant. ♂ 5-10 cm. diam. Sepals white, spathulate to obovate or oblong, c. 4 × 1 cm., glab. Stamens ∞, filaments 1-1·5 cm. long, anthers c. 2 mm. long, narrow-oblong, obtuse. ♀ with smaller sepals; stamens few, us. abortive; achenes ∞, pubescent, c. 2 mm. long; style plumose, 3-5 cm. long.

2n = 16

2n = 16

Robust high-climbing evergreen woody climber. Lvs glabrous above, sparsely hairy beneath, 3-foliolate, (5)-7-13-(18) × 6-12-(19) cm; leaflets coriaceous, broadly ovate to broad-oblong, cordate to truncate at base; margin entire to crenately toothed or lobed near apex, rarely deeply lobed to almost dissected; petiole (2)-3-6-(7) cm long. Fls unisexual, in compound axillary dichasial cymes. Bracts paired; lower pair often leaflike, united, usually inserted below middle of pedicel. ♂ fls: sepals 6, imbricate, white, glabrous above, hairy beneath, spathulate to obovate or oblong, 25-35-(45) × 8-15-(20) mm; anthers 1.5-2-(2.5) mm long; filaments sparsely hairy or glabrous. ♀ fls: sepals 6, similar to ♂, (16)-20-25-(35) × 7-10-(13) mm; staminodes few. Achenes hairy, 2-4 mm long. Style (2.5)-3.5-6.5 cm long at fruiting.