Description from Flora of China
Quercus garrettiana Craib, Bull. Misc. Inform. Kew 1911: 471. 1911; Pasania garrettiana (Craib) Hickel & A. Camus.
Trees ca. 20 m tall. Branchlets stout, densely tawny tomentose. Petiole 1-2 cm, stout, hairy; leaf blade oblanceolate to sometimes ovate, 12-22 × 4-8 cm, leathery, tawny tomentose when young, abaxially glabrescent but with tawny, waxy scalelike trichomes with age, base cuneate, apex acute; midvein abaxially pilose; secondary veins 10-13 on each side of midvein, adaxially ± impressed, abruptly curving apically near margin, apical ones fusing; tertiary veins abaxially conspicuous, subparallel. Male inflorescences spicate or paniculate; rachis tomentose. Female and androgynous inflorescences to 20 cm; cupules in clusters of ca. 3. Cupule ca. 1.5 × 2-2.5 cm including bracts, enclosing ± 2/3 of nut, outside hairy, wall less than 1 mm thick; bracts 4-6 mm, squamose when young but elongating after flowering and linear and curved in fruit. Nut depressed globose, 0.8-1.2 × 1.2-1.5 cm, apex ± pointed, wall ca. 0.5 mm thick; scar 0.9-1.2 cm in diam., concave. Fl. Jun-Aug, fr. in Autumn of following year.
Mixed mesophytic forests; above 1000 m. SW Yunnan [Laos, Myanmar, N Thailand, Vietnam]