Evergreen tree, up to c. 25(-30) m. Twigs often with conspicuous leaf-scars. Leaves (3—)7—18(—25)-jugate; rachis terete, (10-)30-100 cm, including the 5-30 cm long petiole, up to c. 8 mm diam., usually with distinctly swollen base, usually ± lenticellate; leaflets usually oblong to lanceolate, hardly or not asymmetrical, 5-20 by 2-7 cm, not or only slightly increasing in size towards the top of the leaf, often the lowermost pairs much smaller, base usually acute to rounded, apex acuminate to cuspidate, glabrous to moderately pubescent, always without domatia; midrib usually deeply impressed above; nerves 5-16 pairs, ascending, looped. Panicles terminal, nearly always pendulous and lax, rarely erect (then also small), pyramidal, usually large, (15—)50—150 cm and profusely branched up to the 3rd order, ± pubescent, bearing numerous glomerulate or crowded flowers which are usually spicately arranged, the glomerules often with regular space; main axis terete, often bent down abruptly at the base; primary side-axes many, usually long, up to c. 90 cm, never subtended by leaves; bracts ovate to narrowly triangular, up to c. 5 mm, ± pubescent. Pedicels absent, up to c. 1 mm. Mature buds 1.5-2 mm diam. Sepals 5 (4), ovate, more or less unequal, the inner 3 or 4 c. 1 mm, the outer 2 or 1 usually much smaller, often minute and sometimes slightly keeled, sometimes somewhat lowered on the pedicel, all glabrous, and with an entire margin. Outer petals 1.5-2 mm. Inner petals about halfway bifid, c. 0.6 mm, with ciliolate, rarely glabrous lobes, usually with a minute central lobule. Filaments c. 1 mm. Ovary (0.5-)0.7(-l) mm, usually densely, sometimes sparsely pubescent, rarely glabrous. Fruit (sub)globose, when ripe 7-10 mm diam.; endocarp subglobose, often somewhat depressed to applanate at the ventral side, usually strongly oblique, (5-)6-9 mm diam., with usually distinct, rather coarse, mostly sharply prominent reticulum; median keel sharp and prominent, at one end often running out into a small to minute ventral processus or tubercle; ventral pore not or not much sunken.
Dense primary forest and often in more open secondary formations; on various soil types; usually at low to medium elevations, occasionally ascending to 1,500 metres, with subspecies nervosa ascending to 2,900 metres.
More
Primary and often secondary forests, at low and medium altitudes, occasionally ascending to 1500 m, f. nervosa to 2900 m, on various soil types.