Tree to 80 m high, to 300 cm dbh, sometimes with somewhat exposed roots but not with knee-shaped pneumatophores. Bark dark grey, brown or black, smooth with squarish scales; inner bark cream, pale grey or pale reddish; wood cream or white. Branchlets 3.5-9 mm wide, glabrous. Leaves in whorls of 4-8; stipules 3-6 mm long; petiole 2-6.2 cm long, glabrous; blade coriaceous to papery, obovate, oblong or elliptic, 5.5-42 by 1.8-14 cm, 1.6-4.3 times as long as wide, apex short acuminate to rounded, base subcordate to rounded (sometimes from a narrowed base), rarely cuneate, margin crenulate or weakly crenulate, glabrous above and beneath, glaucous beneath or not, midrib sunken to slightly raised above, 12-24 pairs of secondary veins, at 45-80° from midrib, clearly distinguishable from tertiary venation and prominent or flat above and prominent beneath, tertiary venation reticulate or subscalariform, prominent above and beneath. Inflorescence arranged in whorls, 4−18 cm long, glabrous, many-flowered; peduncle 2.5-9.2 cm long; pedicels 1.5−6.5 mm long. Sepals ovate or orbicular, 1-3 by 0.8-2 mm, 1-1.5 times as long as wide, apex rounded to acute, ciliate or not, glabrous. Corolla white, yellowish green or pinkish yellow; tube 1.1-3 mm long, 0.3-0.6 times as long as lobes, glabrous inside and outside; lobes 3-9 by 1.2-2.3 mm, 1.7-4.4 times as long as wide, glabrous outside and inside. Stamens inserted at 0.5-0.6 mm from corolla base which is 0.2-0.36 of tube length; anthers 1.1-1.4 by 0.4-0.5 mm, 2.7-3 times as long as wide, exserted 0-0.88 mm from corolla throat. Ovaries 0.3-0.6 mm long; style 0-0.2 mm long; style head 0.5-0.7 mm long. Fruit 18-40 by 2.5-4 cm. Seeds: grains c. 2.5 by 1.5 cm, c. 5 by 2 cm with wing.
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A big tree. It grows 60 m high and spreads 9 m wide. It is 27 m until the first branch. The trunk can be 2 m wide. The leaves are simple and oval. They are 7-18 cm long. They are in rings near the ends of branches. The flowers are 3.5 mm across and white. They are in rings. The fruit can be 32 cm long. They are brown, dry, woody and curved. They split along one side when ripe. The seeds are flat and winged.
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