Quercus glauca Thunb.

Japan; Taiwan; China (Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang); Korea; North India; Myanmar; Indo-china; in forests from 100 m to 2600 m; introduced in Europe in 1804;

to 10 m tall usually; often shrubby, but may reach 15 m and more (20 m in Taiwan, trunk to 45 cm in diameter); crown ovoid at first, becoming domed;

6-13 x 2.5-5 cm; evergreen; oboval to oblong-elliptic; thick, leathery; entire, slightly serrate in apical 1/2; apex acuminate to caudate; base rounded or broadly cuneate; shiny dark green adaxially; blue green, pubescent beneath but glabrescent; young leaves pubescent, variable in color : brown, bronze, purple or green; 9-13 parallel, slightly curved, prominent beneath vein pairs; tertiary veins inconspicuous beneath; petiole 1-3 cm, yellow;

male flowers on catkins shorter than the leaves, drooping, with long bracts, 4-5 stamens; female inflorescences short, bearing 2-4 flowers;

acorn ovoid, oblong-ovoid or ellipsoid, 1-1.6 cm long, 0.9-1.4 cm in diameter; single or to 3; enclosed 1/3 or 1/2 by bowl-shaped cup; cup with 5-6 concentric rings, slightly hairy to hairless, 1-1.3 cm in diameter; maturing in 1 year;

– A. Camus : n° 47; – Sub-genus Cerris, Section Cyclobalanopsis; – Section Glauca, sub-section Glaucae ( Menitsky ); – This taxon is an element of a large complex, wide-spreading, described under many uncertain species names (such as Q.globosa (Lin & Liu) J.C.Liao 1970 = Cyclobalanopsis globosa T.P. Lin & T.S. Liu 1965, in Taiwan, which could be distinguished in having globose acorns); – OOTW reports hybrid: Q. × kiusiana (Q. glauca × Q. hondae)