Changes

*A medium-sized to fairly large tree of up to 35 m tall, bole straight and with small buttresses; young parts buff caducous puberulent, more or less persistently on panicles, calyx and parts of petals exposed in bud; leaves .*Leaves lanceolate-falcate to ovate, 6-13 cm × 2.5-6.5 cm, thin leathery, with dull, minutely stellate undersurface, base cuneate, unequal, acumen slender, tapering, up to 1.5 cm long, venation scalariform, midrib slightly raised above, secondary veins 7-10 pairs, slender but distinctly elevated beneath; stamens .*Stamens 15, in 3 subequal verticils, ovary and stylopodium broadly pear-shaped, somewhat abruptly tapering to the short columnar style; fruit .*Fruit calyx lobes unequal but the 2 longer ones only slightly longer than the nut and becoming reflexed.  ''H. gregaria'' occurs often gregariously in primary forest on well-drained, hilly or steep places on stony or clayey soil at low altitudes. The density of the wood is 990-1110 kg/m³at 15% moisture content.