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Tree up to 18 m. high, with globose or umbrella-shaped open crown; bark ridged and flaky, red-brown to brown. Branchlets densely sericeous-villous with golden antrorse hairs 3–4 mm. long, ringed by the scars of the fallen sheathing leaf-bases; scars at first villous, later glabrescent. Leaves imparipinnate, up to 40 cm. long, viscid; leaflets 5–7(8) on each side, usually 12–15 x 3·5–5·5 cm., subopposite, sessile or almost so, narrowly oblong, acuminate at apex, obliquely rounded to subcordate at the base, ± glabrescent above, densely silvery sericeous-villous to glabrescent below; margins finely dentate; main leaflet pairs alternating with 1(3) reduced subcircular ones, the latter with up to 5 teeth or minute and entire; rhachis and petiole with soft patent hairs up to 4 mm. long; petiole up to 15 cm. long; stipules (3)6–9 cm. long, membranous, reddish at first but becoming brown, adnate to petiole throughout almost their whole length. Panicles many-flowered, much-branched, terminal, drooping, up to 60 cm. long; female panicles bulkier than the male ones; flowers subtended by 2(3) broadly rounded bracts. male flowers orange-buff to white, c. 8 mm. in diameter; calyx-tube obconical, c. 1·5 mm. long, densely hairy outside; epicalyx-lobes c. 1·5 x 0·5 mm., oblong; calyx-lobes 4–5 x 2·5–3 mm., oblong to obovate, recurved and with the abaxial surface concave, clearly veined; petals 1·5 mm. long, linear, fugacious (? or absent); stamens (8)10–15(20), anthers sparsely hairy; carpels vestigial, enclosed by the receptacle. female and hermaphrodite flowers red, viscid, up to 1·5 cm. in diameter; calyx-tube c. 1 mm. long, obconical, densely hairy outside; epicalyx-lobes c. 1 x 0·4 cm., unequal, oblong-elliptic to obovate with apex obtuse, clearly veined, accrescent in fruit; calyx-lobes c. 3 x 2 mm., broadly ovate-acute with the apex acute, clearly veined; petals not seen (? absent or fugacious); stamens 0, or if present then fewer and smaller than in male flowers; carpels (1)2, apically villous, with styles c. 1·5 mm. long; stigmas 0·75 mm. wide, hairy. Achenes enclosed within the calyx-tube with its accrescent epicalyx and persistent calyx-lobes; often only one of the achenes developing; pericarp thin, fragile, brown, reticulately rugose.