Description from Flora of China
Quercus thomsonii Miquel, Ann. Mus. Bot. Lugduno-Batavi 1: 109. 1863; Pasania thomsonii (Miquel) Hickel & A. Camus; Q. turbinata Roxburgh (1832), not Blume (1825); Synaedrys thomsonii (Miquel) Koidzumi.
Trees 8-10 m tall; branchlets, petioles, young leaf blades abaxially, and inflorescences densely covered with grayish, crisp minute hairs. Branches of last year dark brown to blackish when dry, glabrescent, lenticellate; lenticels gray. Petiole rarely longer than 1 cm; leaf blade ovate to broadly elliptic or sometimes obovate to obovate-elliptic, 9-20 × 4-6.5 cm, thickly papery, abaxially glaucous and with adherent, waxy scalelike trichomes, base acute to cuneate, margin usually undulate, apex obtuse to acuminate; secondary veins 10-13 on each side of midvein, ramified near margin but rarely fusing; tertiary veins abaxially slender, evident. Male inflorescences solitary in axils of leaves, 5-10 cm. Female inflorescences 5-10 cm; cupules in clusters of ca. 3; young cupules depressed globose, apically flat. Infructescence ca. 10 cm. Cupule cupular, 1.5-1.8 cm in diam., outside and nut densely covered with grayish crisp minute hairs and scurfy scalelike trichomes. Nut 1.3-1.4 × 1.4-1.6 cm; scar covering ca. 1/3 of nut, convex. Fl. Jun-Aug, fr. Aug-Oct of following year.
Broad-leaved evergreen forests; 800-3000 m. SE Xizang (Mêdog Xian), S and W Yunnan [NE India, Myanmar, N Thailand, Vietnam]