Tree, up to 40 m high with 25 m clean trunk, 90 cm diam., with reddish bark. Leaves elliptic to obovate, 4-8-, usually 6-7-nerved, ca 5-12 by 3½-6½ cm, with rounded, sometimes slightly emarginate, to obtuse apex, acute base, decurrent along the petiole, and entire margin. Petiole 1-1½ cm long. Flowers axillary, solitary or 2(-3) serially placed, less often 3-6 on the apical part of a branch in the axil of distinct leaf-scars. Flowers ca 3½ cm diam., on 2½-1½ cm long pedicels. Sepals 5, ovate to elliptic, the outer one ca 8½ by 7 mm, the inner four 12-16 by 8-11 mm. Petals yellow, about oblong, 20 by 9 mm. Stamens in 2 distinct groups, the outer ones ca 110, 4-4½ mm long, straight in bud, the inner ones ca 10, 10-11 mm long, distinctly thicker than those of the outer group, with their apex reflexed in bud; opening with lateral longitudinal slits. Carpels 4-6, usually 5, ca 4-4½ by 1-1½ mm, with 5½-6½ mm long styles; each with 7-10 ovules. Fruit dehiscent. Carpels ca 15 by 12 mm, 1-2-seeded. Seeds obovate, 3 by 2 mm, enclosed by a red, membranaceous aril.
In primary or old secondary lowland forests, on wet, often peaty soil. Seems to be flowering at irregular intervals.
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In primary and also in old secondary lowland forests, growing on wet, often peaty soils.
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