Oaks of the World

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  Quercus acuta
Author Thunb. 1784 Contr. U. S. Natl. Herb. 23: 185
Synonyms Cyclobalanopsis acuta (Thunb. in Murray) Oerst. 1867
buergeri Blume 1851
marginata Blume 1851
laevigata Blume 1851
angustifolia hort.
acuta var. acutiformis Nakai 1929
Local names japanese green oak; okagashi;
Range Japan; Taiwan; South Korea; China (Guizhou); introduced in Europe in 1878;
Growth habit reaches 10 m tall, with a trunk 30 cm in diameter, but more often shrubby in cultivation; rounded crown;
Leaves 5-18 cm long, 2-6 cm wide; oval to elliptic, entire, persistent, leathery; the wavy margin is sometimes few toothed; apex acuminate; base cuneate to rounded; lustrous dark green above, paler below; 8-13 pairs of lateral veins at an angle of 40-45° with midrib; large petiole to 2-3 cm, orangish pubescent, slightly compressed.
Flowers pistillate flowers on 5 cm long stems with 3-5 flowers; male flowers with 10-12 stamens; 3-4 short styles;
Fruits elliptic orangish brown acorns to 2cm long, clustered on stalk to 4-5 cm long; narrow raised scar;  downy cup with 5-8 concentric rings of narrow, hairy scales; ripenning first year;

Bark, twigs and

dark grey brown, shallowly furrowed, smooth bark ; pubescent orangish young twigs, becoming glabrous and dark brown; pale yellow, glabrous, 8-12 mm long, conical buds; stipules 1.5 cm long, linear, hairy;
Hardiness zone, habitat a little tender (hardiness zone 8); prefers a lime-free soil; rather slow growing;
Miscellaneous -- A. Camus : tome 1, p. 307, n 5;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Acuta (Menitsky);
-- Very rare in cultivation;
-- Hybridizes with Q.glauca = Q.x idzuensis Makino 1965;

Subspecies and
-- var. paucidentata (Franch.) J.C.Liao

-- var. sinensis Chun :
China (Guizhou), 700 m; shady ravines;