Oaks of the World

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 Quercus sessilifolia
Author Blume 1850
Synonyms Cyclobalanopsis sessilifolia (Bl.) Schottky 1912
Cyclobalanopsis nubium (Hand.-Mazz.)
Chun ex Zheng 1982
Cyclobalanopsis paucidentata (Franch. ex Nak.) Kudo & Masamune 1930
changii F.P.Metcalf 1931
nubium Handel-Mazzetti 1922 (Camus n 22 )
paucidentata Franchet ex Nakai 1926
Local namesyun shan qing gang ;
Range South and Central China (Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Zhejiang); Taiwan; South Japan; 1000-2600 m;
Growth habitsmall tree, reaching sometimes 20 m tall; trunk to 0.6 m in diameter;  
Leaves 6-15 x 1.5-4 cm; oblong-elliptic to lanceolate-elliptic; leathery; apex shortly acuminate; base obtuse or cuneate; margin entire or with 3-4 serrations towards apex; hairless on both sides; nearly concolorous; midrib impressed adaxially; 10-14 vein pairs inconspicuous; petiole hairless, not sulcate, 5-10 mm long;
FlowersApril-May; male flowers with short stamens; pistillate inflorescences 1.5 cm long;
Fruits acorn 1.7-2.4 cm long, 0.8-1.5 cm in diameter; obovoid to ellipsoid-obovoid; basal scar narrow, 5-7 mm wide, slightly convex; enclosed 1/3 by cup; cup thin, tomentose, 1-1.5 cm wide, with 5-7 concentric rings of scales; margin of 2 or 3 rings near base denticulate; stylopodium persistent; maturing in 1 year;

Bark, twigs and
buds

bark hard, fissured horizontally; twig bloomy, glaucous, with hairy, grey brown, rounded lenticels;
Hardiness zone, habitatzone 7-8;
Miscellaneous

-- Sub-genus Cyclobalanopsis;
-- Section Acuta (Menitsky)
-- Hybrid with Q.acuta = Q.x takaoyamensis Makino;

Subspecies and
varieties
 
Pictures

drawing 1
drawing 2