Changes

*A medium-sized to fairly large semi-deciduous tree of up to 40 m tall, bole branchless for up to 25 m and up to 125 cm in diameter, buttresses low, bark surface pale grey or blackish-brown, outer bark yellowish-brown; buds ovoid-lanceolate, rufous silky velutinous; leaves .*Leaves narrowly ovate to elliptical, 16-40 cm × 7.5-14 cm, base broadly cuneate to subcordate, acumen up to 5 mm long, secondary veins 24-30 pairs, ascending, midrib above sparsely velutinous, below caducously sparsely velutinous, petiole 4-6 cm long, stipules lanceolate, subacute, persistently velutinous outside; stamens .*Stamens about 30; fruit .*Fruit calyx tube ellipsoid, glabrous, with 5 narrow ridges running from the apex along 2/3 of the length of the tube, 2 larger fruit calyx lobes up to 20 cm × 5.5 cm, 3 shorter ones up to 15 mm × 6 mm.  ''D. dyeri'' occurs in semi-evergreen dipterocarp forest and ''Schima'' -bamboo forest, often along streams, on swamp edges or in valleys at low elevation. The density of the wood is 630-830 kg/m³at 15% moisture content.