Pasania trachycarpa Hickel & A. Camus, Bull. Mus. Natl. Hist. Nat. 29: 604. 1923; Lithocarpus trachycarpus var. jakhuangensis Hu ex A. Camus; Pasania yui Hu.

Trees to 20 m tall. Branchlets sulcate, sparsely covered with early glabrescent long hairs. Leaf blade lanceolate to elliptic, 8-15 × 2-6 cm, rigidly papery, base cuneate, margin entire, apex acuminate to acute; midvein abaxially covered with early glabrescent long hairs; secondary veins 12-16 on each side of midvein, abruptly curving near margin but not fusing; tertiary veins abaxially slender, evident to conspicuous, subparallel. Male inflorescences paniculate, 5-9 cm. Female inflorescences to 20 cm; rachis puberulent; cupules in clusters of ca. 3. Cupule globose to depressed, 1.5-2 cm, completely enclosing nut, outside with oily scalelike glands, reddish brown when dry, wall ca. 0.5 mm thick; bracts subulate, 1-1.5 mm. Nut ± depressed globose, 1-1.3 × 1.6-1.8 cm, glabrous, wall ca. 1 mm thick; scar at basal part of nut, ca. 1 cm in diam., slightly concave. Fl. Nov-Mar, fr. Nov-Mar of following year.

Broad-leaved evergreen forests; 800-1300 m. S to SW Yunnan [Laos, N Thailand, Vietnam]