Changes

*''Hopea dealbata'' Hance (1877).

*A medium-sized or large tree of up to 50 m tall, bole often straight, branchless for 15-21 m and up to 165 cm in diameter, buttresses sometimes large and coarse, bark surface fibrous, dark brown; young parts densely buff puberulent, more or less caducous on twigs, leaf beneath and calyx; leaves .*Leaves oblong-lanceolate or occasionally oblanceolate, (5-)10-24 cm × (2-)4.5-8 cm, leathery, silvery lepidote beneath, base cuneate to occasionally cordate, subequal, apex shortly broadly acuminate or obtuse, venation scalariform, midrib shallowly channelled above, secondary veins (12-)14-16 pairs, slender but prominent beneath, obscure above; stamens .*Stamens 15, ovary and stylopodium cylindrical, subtruncate, style shorter than ovary and stylopodium, columnar; .*2 longer fruit calyx lobes up to 6.5 cm × 1.8 cm, spatulate, obtuse, 3 shorter ones up to 5 mm × 3 mm, ovate.  ''H. helferi'' occurs on deep soils especially on sedimentary rocks on hill slopes and undulating land in semi-evergreen forest up to over 500 m altitude. The density of the wood is 895-1125 kg/m³at 15% moisture content. See also the table on wood properties.