Changes

*A large tree up to 50 m tall, bole straight, branchless for up to 21 m, up to 120 cm in diameter, bark surface smooth to roughly scaly, greyish-yellow to green, inner bark exuding a resin turning black, bole and branches thorny when young; stipules .*Stipules absent or early caducous, inserted at the base of the petiole, narrow; leaves with 7-11 pairs of leaflets, often lacking a terminal leaflet, leaflets distinctly to gradually acuminate at apex, margin entire, glabrous, with 20-30 pairs of secondary veins which are visible on both surfaces; inflorescence .*Inflorescence axillary, laxly paniculate; male .*Male flowers 8-9 mm long, female ones 6 mm long, stamens 6; fruit .*Fruit ovoid, rounded triangular in cross-section, 15 mm × 10 mm, glabrous.  ''C. sumatranum'' is found scattered in primary and secondary lowland and hill forest, up to 500 m altitude. The density of the sapwood is 370-650 kg/m³at 15% moisture content.