Trees to 18 m tall, glabrous except for inflorescences. Branchlets purplish brown, dark brown when dry, sulcate. Petiole 2-3 cm; leaf blade lanceolate, elliptic, or oblanceolate, 7-18 × 3-6 cm, rigidly leathery, abaxially with scalelike glands, base often asymmetric and attenuate-cuneate to rarely acute or subrounded, margin obtusely undulate-dentate on apical part or rarely entire, apex caudate and often falcate; secondary veins 8-13 on each side of midvein; tertiary veins abaxially obscure. Inflorescences terminal at apex of current year's branches. Male inflorescences arranged in a panicle; rachis puberulent. Female inflorescence with cupules in clusters of ca. 3 or solitary, scattered on rachis. Infructescences 10-15 cm; rachis 4-5 mm thick. Cupule cupular, 6-10 mm × 1.4-2 cm, enclosing 1/10-1/6 of nut, wall 1-2 mm thick; bracts imbricate, triangular to rhomboid, lamellate, puberulent, margin and midvein ± ridged. Nut conical to broadly ellipsoid, 2.2-2.8 × 1.6-2.2 cm, apex rounded to obtuse, wall 1.5-2 mm thick; scar 0.9-1.2 cm in diam., concave. Fl. May-Jun, fr. Sep-Oct of following year.
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