Tree, 10-30 m by 30-90 cm ø; bark grey, rough and lenticellate. Young branchlets greyish black, tomentose, older ones glabrous, lenticellate; terminal bud ovoid-ellipsoid, 5 by 2 mm, scales ovate-acute, 5 by 2 mm, more or less hairy. Stipules, if distinct, triangular, 1 mm, caducous. Leaves (6-) 10-15(-20) by 4-7½ cm (index 2.1-3), widest slightly below to slightly above the middle; discol-orous, upper surface glabrous, dull, lower surface with greyish brown stellate tomentum (magnification 35!); base rounded to acute, somewhat decurrent, apex more or less acute; midrib and nerves ± prominent beneath, slightly so above; nerves 10-15 pairs at an angle of 60-80°, parallel, arcuating towards the margin; reticulation fine, parallel, obscure on both surfaces; petiole glabrous, 1-2 cm, adaxially flat or shallowly furrowed. Male rachis 10-15 cm, 1 mm ø; bracts ovate-acute, ½ by ½ mm, with dense tomentum; ♂ flowers solitary or in clusters of 3-7; perianth deeply 6-lobed, lobes rounded, ½ mm long, hairy; stamens 12, filaments 2-3 mm, glabrous, anthers 0.1-0.2 mm long; pistillode rounded-triangular, 1 mm ø, densely woolly pubescent. Female and mixed androgynous rachis 10-15 cm, 1-2 mm ø; ♀ flowers solitary or in cluster of 3-4; perianth deeply 6-lobed, lobes rounded, ½ mm long hairy, staminodes 12, styles 3, conical-cylindrical, ½ mm, pubescent at base. Young cupule on stalk 2-5 mm, subglobose, densely covered with the future spines pointing to the top. Ripe cupule 2-4 by 2-3 cm, hoary with minute fulvous hairs, depressed obovoid-globose, regularly or irregularly 3-4-lobed, sometimes constricted at both ends; surface marked with 4-5 more or less parallel, curving bands bearing short, more or less distinct thick tubercles; wall 1-2 mm thick, completely enclosing the 1-4 fruits. Dehiscence badly known; by 4 valves? Fruits 1-4, with dense reddish brown tomentum, 2-3 by 1½-2 cm, completely free from the cupule except for the convex, glabrous, rugose base; central fruit in cross-section asymmetrically rounded-triangular, ovoid-conical, flattened laterally and rounded adaxially; lateral fruits smaller, ovoid-globose, flattened adaxially and rounded on the free sides.
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A tall evergreen tree. It grows 30 m tall. The leaves are narrowly oval and 7-23 cm long by 3-9 cm wide. The base is rounded and they taper to the tip. The leaf stalks are softly hairy. The seeds or nuts are triangle shaped. The nuts are in a case which does not have spines. It is 25 mm across.
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