Description from Flora of China
Quercus pentacycla Y. T. Chang, Acta Phytotax. Sin. 11: 256. 1966.
Trees to 15 m tall. Branchlets thick, grayish brown, glabrous, sparsely lenticellate; lenticels gray. Petiole 1.5-2 cm, sulcate, glabrous; leaf blade ovate-elliptic, 10-14 × 4-6 cm, leathery, abaxially whitish chaffy or with prostrate simple hairs, adaxially green and glabrous, base subrounded and slightly oblique, margin serrulate, apex acute to shortly acuminate; secondary veins 13-15 on each side of midvein; tertiary veins abaxially slender, evident. Cupule obconic, ca. 6 mm × 1.2 cm, enclosing 1/3-1/2 of nut, outside whitish tomentose, inside prostrate sericeous, wall ca. 1 mm thick; bracts in (4 or)5 rings, margin dentate. Nut reddish brown, ovoid-ellipsoid, ca. 1.7 × 1.2 cm, shiny; scar ca. 7 mm in diam., convex; stylopodium ca. 2.5 mm in diam. Fr. Nov.
* Mixed mesophytic forests in mountains; 1400-1500 m. SE Yunnan (Malipo Xian)