Changes

*''Dipterocarpus pilosus'' Roxb. (1832), *''Dipterocarpus marginatus'' Korth. (1841), *''Dipterocarpus vernicifluus'' (Blanco) Blanco (1845).

*A large tree of up to 50 m tall, bole branchless for 30 m or more, cylindrical, up to 180 cm in diameter, buttresses small to large, rounded, bark surface reddish-brown, older patches pink-brown or grey, outer bark grey-brown, inner bark reddish-brown, brittle, sapwood ochre; buds narrowly conical, scabrid rufous tomentose; leaves .*Leaves elliptical to ovate, 8-15 cm × 4-10 cm, base obtuse, apex shortly acuminate, with 12-20 pairs of secondary veins, petiole 2-2.5 cm long, stipules narrowly lanceolate, outside persistently rufous tomentose; stamens .*Stamens about 30; fruit .*Fruit calyx tube spherical, glabrous, smooth, 2 larger fruit calyx lobes up to 14 cm × 2.5 cm, 3 shorter ones up to 2 cm × 1 cm.  ''D. gracilis'' is widespread, often occurring gregariously in seasonal semi-evergreen or evergreen dipterocarp forest on red soils, becoming scattered, rare, and confined to fertile red soils in the humid zones, up to 800 m altitude. The density of the wood is 580-1000 kg/m³at 15% moisture content. See also the table on wood properties. A natural hybrid between ''D. gracilis'' and ''D. costatus'' has been observed in Thailand and Peninsular Malaysia.