Tree, 10-33 m by 15-50 cm Ø, sometimes with stout buttresses; bark smooth, pale ochre-brown, shallowly flaky. Branchlets glabrous, slender, bark finely fissured, greyish; terminal bud ovoid, 2-3 by 2 mm, scales linear-acute, 2-3 by ½ mm. Stipules linear-acute, 2-3½ by ½ mm. Leaves chartaceous, 5-13 by 2-4 cm (index 2.3-3.6), widest at the middle to slightly below; base rounded and abruptly acute, top ± abruptly acuminate (tip ½-2 cm); surfaces glabrous, ± discolorous, above greenish and glossy, beneath green-brownish and less glossy; midrib slightly prominent on both surfaces, stronger beneath; nerves 5-8 pairs, thin, flattish on both surfaces, at an angle of 70-80°, subparallel, arcuating and anastomosing near the margin; reticulation irregular, sometimes obscure; petiole 0.8-1½ cm, blackish towards the base, adaxially sulcate. Male rachis 10-15 cm by 1-2 mm; bracts broadly ovate-rounded, membranous, 0.7 by 1 mm, bracteoles lanceolate-rounded, membranous, 0.7-1 by 0.3-0.4 mm; ♂ flowers in clusters of 3; perianth deeply incised, lobes 6, membranous, elliptic-acute, 1-1½ by 0.7 mm, hairy outside, stamens 6-8, filaments 2½-3 mm, anthers 0.2-0.25 mm long, pistillode 1-1½ mm ø. Female rachis 10 cm by 1-2 mm; bracts and bracteoles ovate-acute, 0.7 by 1-1½ mm; ♀ flowers solitary; perianth deeply incised, lobes 6, membranous, ovate-acute, 0.7-1 by 0.4-0.6 mm, densely hairy outside, staminodes 12, rudimentary, styles 3, conical, 1-1½ mm. Ripe cupule sessile, subglobose, 2½-3 by 2-2½ cm; wall 1 mm thick, sparsely hairy, mostly very densely set (except the narrow adaxial sector and abaxial suture) with slender to rather sturdy spines 6-12 mm long, in bundles, not branched, straight to slightly recurved, subglabrous; indehiscent. Fruit solitary, ovoid to compressed-reniform, 1½-2 by 1-1½ cm, adaxially flat, wall 1-2 mm thick, woody, completely adnate to the cupule, rugose and glabrous; cotyledons flat-convex.
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