Oaks of the World

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  Quercus glauca
Author Thunb. 1784
Synonyms Cyclobalanopsis glauca (Thunb.) Oerst. 1867
Cyclobalanopsis glauca var. kuyuensis (Liao) Liao
Cyclobalanopsis repandifolia (Liao) Liao 1976
amamiana Hatus. 1951
blakei var. vaniotii (H.LÚv.)
Chun 1928
glauca var. annulata (Smith) A.Camus 1936
glauca subsp euglauca A.Camus
glauca var. kuyuensis J.C.Liao
globosa (Lin & Liu) Liao 1970
ichangensis Nakai ex A.Camus 1938
lacera Blume 1851
longipes Hu 1951, nom. illeg. not Stev. 1857
lotungensis Chun & Ko 1958
matasii Siebold 1830
phullata Buch.- Ham. ex D.Don 1825
repandifolia Liao 1968
sasakii Kaneh. 1916
tranninhensis Hick. & A.Camus 1921 (A. Camus n░ 48)
vaniotii H.LÚv. 1913
Local names Ara-kasi ; blue Japanese oak ;
Range 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;
Growth habit 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;
Leaves 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;
Flowers male flowers on catkins shorter than the leaves, drooping, with long bracts, 4-5 stamens; female inflorescences short, bearing 2-4 flowers;
Fruits 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 cup; cup with 5-6 concentric rings, slightly hairy to hairless, 1-1.3 cm in diameter; maturing in 1 year;

Bark, twigs and
buds

bark blackish brown, smooth at first aging furrowed and rough; young twigs glabrescent, thick, stiff, dark olive green, with pale lenticels; buds 5-7 in clusters, ovoid to globose, rusty brown, 3-8 mm, with some hairy scales basally;
Hardiness zone, habitat zone 7-8; all types of soils except calcareous ones; slow growing;
Miscellaneous -- A. Camus : n░ 47;
-- Sub-genus 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);
Subspecies and
varieties

-- Q.annulata Smith in Rees 1819
= Q.phullata Buch.-Ham. ex D.Don 1825
= Cyclobalanopsis annulata (Sm.) )0erst. 1867
= Q. glauca subsp annulata (Sm.) A.Camus 1938
for some Authors, is conspecific with Q.glauca Thunb., which occurs also in Nepaul, Himalaya, Vietnam; for other Authors (Flora of China), it is a possibly true species. Leaves are more dentate than in glauca (2/3 of the margin), with an apex more acuminate, and undersides more bloomy with whitish, simple hairs. Moreover, the cupule is made of 7-9 concentric rings; stylopodium with often 4 rings at its base. China (W Sichuan, E Xizang, W à SW Yunnan); Nepaul;

-- f. gracilis Rehd. & Wils. 1916
= Q.ciliaris : see the file

-- var. hypargyrea Seemen ex Diels 1900
= Q.hypargyrea : see the file

Pictures

drawing 1