Description from Flora of China
Quercus cyrtocarpa Drake, J. Bot. (Morot) 4: 150. 1890; Lithocarpus anisobalanos Chun & F. C. How; L. uncinatus A. Camus; Pasania cyrtocarpa (Drake) Schottky; Synaedrys cyrtocarpa (Drake) Koidzumi.
Trees 10-18 m tall. Branchlets densely pubescent and with early glabrescent, brown long hairs. Petiole 1-2 cm; leaf blade ovate, ovate-elliptic, or oblong, 5-10 × 2-4 cm, papery, concolorous, abaxially covered with stellate, minute scalelike trichomes and sparsely pilose on midvein, adaxially crisply pubescent when young, base acute and sometimes ± asymmetric, margin with a few undulate teeth, apex acute to acuminate; secondary veins 8-12 on each side of midvein, ending in teeth; tertiary veins abaxially slender, evident. Male inflorescences axillary, solitary, 3-6 cm; rachis slender, sparsely pubescent. Female inflorescences 2-5 cm; cupules solitary or in clusters of ca. 3. Cupule disc- to bowl-shaped, 1-2 × 3.5-4.5 cm, enclosing basal part of nut, wall thickly woody; bracts clawlike, woody when dry, apex curved. Nut depressed globose, 1.5-2.2 × 4-5 cm, densely tawny pubescent, apex flat, wall 1-1.5 cm thick and horny; scar 2.5-3.5 cm in diam., concave but with center conspicuously convex. Fl. Apr and Sep-Oct, fr. Oct-Dec.
Broad-leaved evergreen forests; 400-900 m. SW Guangdong, SW Guangxi [NE Vietnam]