Oaks of the World

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  Quercus miyagii
Author Koidz. 1912
Synonyms Cyclobalanopsis miyagii (Koidz.) Kudo & Masam; 1930
Cyclobalanopsis  yayamensis (Koidz.) Kudo & Masam. 1930
Local names  
Range South Japan; Ryukyu Islands;
Growth habit 12 m tall;
Leaves 8-15 cm x 2-4; lanceolate, acuminate; base rounded or sometimes attenuate; leathery; hairless, green above; pale glaucous beneath; seldom toothed; 10-12 pairs of secondary veins; petiole hairless 1.5-2 cm long;
Fruits acorn globose 2.8-3 cm in diameter; cup covering only base of nut, 2-3 cm in diameter; 7-9 crenate rings; maturing first year;

Bark, twigs and

glabrescent shoots, densely covered with lenticels;
Hardiness zone, habitat not hardy; 
Miscellaneous -- A. Camus : n 45;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Glauca, sub-section Glaucae (Menitsky);
-- related to
Q.salicina ;
Subspecies and
--- variety of Lutchu Islands = Q.yayamensis Koidz. 1918
leaves 7-12 x 2.3-4 cm; lanceolate, pointed; hairless, rare teeth; acorn ovoid, mucronate, 2-4 cm in diameter, enclosed 1/3 by woody cup; differs from Q.miyagii in having leaves narrower, less acuminate and less glaucous beneath;