Oaks of the World

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 Quercus delavayi
AuthorFranch. 1899
Synonyms Cyclobalanopsis delavayi (Franchet) Schottky 1912
gilva Skan not Bl.
Local nameshuang mao qing gang ;
RangeChina (Yunnan, Sichuan, Guizhou, Guangxi, Hubei) ; 1000 - 3000 m ;
Growth habit10-30 m tall;
Leaves 8-10 x 3-4.5 cm; oval  lanceolate, shortly acuminate at apex, base cuneate or almost rounded; leathery, thick; margin rarely sinuate, dentate on apical 1/2; glabrous above, densely whitish tomentose beneath with stellate hairs; midrib impressed above, prominent below; 10-14 vein pairs raised beneath; petiole 1-2.5 cm, densely tomentose;
FlowersApril to May; female inflorescences axillary, singly, densely tomentose, 4 cm long, with 2-3 fruits; styles connate only at their base;
Fruitsacorn globose to ovoid, 1.4 cm in diameter; pointed; glabrescent; enclosed 1/2 by cup; cup rather thin, 1.6 cm in diameter, scales in 6-7 concentric rings with margin denticulate; maturing in 2 years;

Bark, twigs and
buds

bark grey brown; young shoots pale brown tomentose;
Hardiness zone, habitatin mixed forests, with Pinus;
Miscellaneous -- A. Camus : n° 36;
-- Sub-genus Cyclobalanopsis;
-- Section Gilva (Menitsky);
-- Close to Q.glauca (but differs in having branchlets tomentose);
Subspecies and
varieties
 
Pictures

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