Changes

*A medium-sized to fairly large tree up to 36 m tall, with bole up to 95 cm in diameter, without buttresses; twigs more or less 4-angled or rounded, terminal bud plump to conical, 2.5-10 mm long; leaves .*Leaves oblong to subelliptical or obovate, 3.5-12.5 cm long, cuneate at base, retuse to rounded at apex, with 7-15(-18) veins per 5 mm; inflorescences .*Inflorescences axillary, branched or not, 5-21-flowered; flowers with 4 tepals; fruit .*Fruit ellipsoid, spherical or ovoid, 11-23 mm long, with thick, compact outer layer, pale green.  ''C. biflorum'' is a variable species, especially in Borneo, and is closely related to ''C.'' ''ferrugineum'' . It is usually found in well-drained mixed dipterocarp forest up to 1100(-1400) m altitude.