Tree, 25-35 m, sometimes up to 45 m, 0,70-1,00 m thick; trunk columnar, unbuttressed. Very young branchlets and both surfaces of very young leaves rather densely clothed with appressed short thick-ish brown hairs, very soon glabrescent; young branchlets obtusely quadrangular, becoming terete with age. Leaves ovate, oblong or lanceolate from a shallowly cordate base, acuminate, firmly coriace-ous, on either side of the (on the lower surface) much prominent costa with numerous widely patent arcuate lateral nerves inarching near the margin and forming there a strong intramarginal nerve, darkgreen above, paler beneath, 7-30 by 4-12 cm; petiole 4-8 mm. Corymbs few-to rather many-flowered, 4-15 cm across, dense or rather lax, at first finely pubescent, afterwards glabrous. Pedicels thick, 1-1½ cm (in bud ½ cm, in fruit to 3½ cm). Buds ovoid-oval, shortly acuminate, with 4 longitudinal ribs (formed by the contiguous margins of the sepals). Flowers inodorous? Calyx when fully expanded during anthesis ± 2½ cm diam., afterwards slightly enlarged; segments shortly acuminate, acute, under fruit patent or reflexed. Petals caducous, shortly clawed, oval, yellowish, about as long as sepals. Stamens 1-seriate, on a narrow circular rim; filaments with a broadly linear lower half and a filiform-subulate upper half; anthers at first yellow, afterwards brown. Style pale green; stigma dark green or red. Capsule ovoid-oblong, 2½-3 cm long, 4-valved. Seeds ∞, 5-6 mm long (2-2½ mm long tails in-cluded); nucleus ± 1 mm.
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A tree. It grows 40 m tall. The trunk can be 100 cm across. It is fluted and has buttresses. The bark is red brown and rough and cracked. The leaves are simple and broadly oval. The base can be rounded or heart shaped. The leaves are bluish-green underneath. The flowers are 4 cm across and white to pink. They come out at night. The fruit is a capsule 2 cm long. There are about 100 seeds. These are 5 mm long.
Usually on alluvial sites and along rivers and streams, in disturbed (open sites) in mixed dipterocarp, swamp and sub-montane forests at elevations up to 1,500 metres.
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Evergreen forests, 60-1200 m, in NW. Sumbawa observed to predominate in majestic trees on the slope of Mt Tambora, possibly also occupying this position in E. Flores.
It is a tropical plant. It grows in mixed dipterocarp, swamp and mountain forests. It grows along rivers and up to 1,200 m above sea level.
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