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*A medium-sized to large tree, bole exceeding 100 cm in diameter and with short and stout buttresses; leaves .*Leaves oblong or elliptical, 7-29 cm × 2.5-7 cm, cream lepidote on the lower surface, with 12-16 pairs of secondary veins drying black beneath; petals .*Petals narrow, stamens 20-24, of several lengths; fruit .*Fruit calyx lobes unequal, larger three up to 7 cm × 1.5 cm.  ''S. lumutensis'' is common in its restricted area on coastal hills above 100 m altitude. The density of the wood is 975-1125 kg/m³at 15% moisture content.