Oaks of the World

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  Quercus miyagii
Author Koidz. 1912 Bot. Mag. (Tokyo) 26: 167

Cyclobalanopsis miyagii (Koidz.) Kudo & Masam; 1930

Local names Okinawa-urairo-gasi

Japan, Lutchu and Okinawa Islands;

Growth habit 12 m tall;
Leaves 8-15 cm x 2-4; lanceolate, seldom linear-oblong or oval-lanceolate; long acuminate at apex; base rounded or obtuse, rarely cuneate; leathery; young leaves both sides silvery-tomentose; hairless, green above; pale glaucous beneath with rather persistent hairs; margin entire, seldom toothed; 10-12 pairs of secondary veins, ascendent, curved, slightly raised beneath; petiole hairless 1.5-2 cm long;
Fruits acorn ovoid-globose 2.8 cm in diameter and 3 cm high; cup flattened covering only base of nut, 2-3 cm in diameter, 8-10 mm high; 6-7 (-9) crenate rings; maturing first year;

Bark, twigs and

glabrescent shoots, densely covered with orbicular, whitish lenticels; buds 8 mm long, with scales on 5 rows; stipules linear, yellowish, deciduous;
Hardiness zone, habitat not hardy; 
Miscellaneous -- A. Camus : tome 1, p. 279, n 45;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Glauca, sub-section Glaucae (Menitsky);
-- Related to
Q.salicina ;

Subspecies and
--- variety of Lutchu Islands = Q.yayeyamensis Koidz. 1918 (sometimes written yayamensis or yaeyamensis after the name of the Yaeyama Islands, in the South-West of Okinawa Island)
buds lanceolate 15 mm long; leaves 7-12 x 2.3-4 cm; lanceolate, pointed at apex, attenuate at base, hairless, margin entire, seldom dentate; 8-10 vein pairs; acorn ovoid, mucronate, 2-4 cm in diameter, enclosed 1/3 by woody cup; cup halfround with 7-9 concentric rings; differs from Q.miyagii in having leaves narrower, less acuminate and less glaucous beneath;