Oaks of the World

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  Quercus tenuicupula
Author (Y.C.Hsu & H.Wei Jen) C.C.Huang 1992
Synonyms Cyclobalanopsis tenuicupula Hsu & Wei Jen 1979
Local names bao dou qing gang;
Range China : Yunnan (Jinping Xian); 900 to 1000 m;
Growth habit reaches 30m;
Leaves 10-25 x 5-10 cm; papery; adaxially glossy green; abaxially greyish green; both sides hairless; apex somewhat caudate; base broadly cuneate; margin entire, or remotely crenate-serrate near apex; midvein adaxially impressed; 9-12 parallel vein pairs, raised beneath; tertiary veins slender, evident abaxially; petiole 2-4 cm long, glabrous, black when dry;
Flowers April; female inflorescence 2-6 cm long, 3 to 5-flowered;
Fruits acorn oblate, 2-2.5 cm high, 2.5-3 cm wide; apex depressed; 1 to 5 on a ca.10 cm long infrutescence; cupule bowl-shaped, 2-4 cm in diameter, 1.5 cm high, enclosing 2/3 of the nut, outside thinly greyish pubescent, 1 mm thick, with 6-7 rings that are wavy and denticulate at margin; basal scar flat, 2-2.5 cm in diameter; stylopodium persistent; maturing in 6 months;

Bark, twigs and
buds

twigs whitish, glabrous, slightly sulcate, with numerous whitish lenticels.
Hardiness zone, habitat not hardy; broad-leaved evergreen mountain forests;
Miscellaneous -- Sub-genus Cyclobalanopsis ;
-- Considered in the Flora of China as possibly a synonym of Q. sichourensis, what needs to be confirmed by more detailed studies, especially as the descriptions of the two species are, in the Flora of China, quite different !
Subspecies and
varieties
 
Pictures drawing of tenuicupula