| 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 varieties |
-- var. paucidentata
(Franch.) J.C.Liao -- var. sinensis Chun : China (Guizhou), 700 m; shady ravines; |
| Pictures |
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