Description from Flora of China
Quercus obovata Bunge.
Trees to 25 m tall, deciduous. Branchlets strong, sulcate, densely yellowish gray stellate tomentose. Petiole 2-5 mm, densely brown tomentose; leaf blade obovate to narrowly so, 10-30 × 6-30 cm, abaxially densely grayish brown stellate tomentose, adaxially dark green and pubescent but glabrescent, base rounded, margin with a few undulate to rough serrations on each side, apex with short, blunt tip; secondary veins 4-10 on each side of midvein; tertiary veins abaxially prominent. Female inflorescences axillary on apical part of young shoot, 1-3 cm. Cupule cupular, 1.2-2 × 2-5 cm including bracts, enclosing 1/2-2/3 of nut; bracts reddish brown, narrowly lanceolate, ca. 1 cm, inflexed or erect, leathery, abaxially with brown filiform hairs, adaxially glabrous. Nut ovoid to broadly so, 1.5-2.3 × 1.2-1.5 cm, glabrous; scar ca. 1 cm in diam., slightly raised; stylopodium ca. 2 mm in diam. Fl. Apr-May, fr. Sep-Oct.
A number of species have been named for what are probably hybrids between Quercus dentata and other species. These species are morphologically intermediate between their putative parental species and include the following: Quercus fangshanensis Liou (Contr. Inst. Bot. Natl. Acad. Peiping 4: 7. 1936), which is probable a hybrid with Quercus aliena var. pekingensis and has been found in Hebei, Henan, and Shanxi; Quercus stewardii Rehder (J. Arnold Arbor. 6: 207. 1925) and Q. fenchengensis H. W. Jen & L. M. Wang (in H. W. Jen & al., Bull. Bot. Res., Harbin 4(4): 196. 1984), which are probable hybrids with Quercus aliena var. acutiserrata and have been found in Anhui, Hubei, Jiangxi, Liaoning, Shaanxi, and Zhejiang; Quercus mongolicodentata Nakai (Bot. Mag. (Tokyo) 40: 164. 1926) and Quercus hopeiensis Liou (Contr. Inst. Bot. Natl. Acad. Peiping 4: 8. 1936), which are probable hybrids with Quercus mongolica and have been found in Gansu, Hebei, Henan, Liaoning, Shandong, and Shanxi, as well as in Korea.
Mixed mesophytic forests; below 100-2700 m. Anhui, Gansu, Guizhou, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Shaanxi, Shandong, Shanxi, Sichuan, Yunnan, Zhejiang [Japan, Korea]