Changes

*''Payena'' ''lancifolia'' H.J. Lam (1925), *''Isonandra'' ''lancifolia'' (H.J. Lam) Baehni (1965).

*A large tree up to 43 m tall, with columnar to fluted bole, up to 65 cm in diameter, and thin buttresses; leaves .*Leaves lanceolate to ovate-lanceolate, glabrous on both sides; flowers .*Flowers small, up to 0.7 cm long, white or pale yellow; fruit .*Fruit ovoid, 3-4.5 cm long, usually with a long apical beak.  A distinct variety occurs in Vietnam: var. ''annamensis'' (Lecomte) v. Bruggen (synonym: ''Payena'' ''annamensis'' Lecomte); it differs from var. ''lanceolata'' in having narrower sepals, a sometimes 7-lobed corolla, longer and more slender stamens, a sometimes 6-7-lobed ovary, and a thinner fruit-wall.  In Peninsular Malaysia ''P. lanceolata'' occurs in lowlands and hills up to 300 m altitude. The density of the timber is high for nyatoh, about 830 kg/m³at 15% moisture content.