Oaks of the World

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  Quercus pentacycla
Author Y.T.Chang 1966 Acta Phytotax. Sin. 11: 256
Synonyms Cyclobalanopsis pentacycla (Y.T. Chang)Y.T. Chang ex Y.C.Hsu & H. Wei Jen 1976
Local names wu huan qing gang ;
Range China (SE Yunnan, Malipo xian) 1400-1500 m ;
Growth habit reaches 15 m tall;
Leaves 10-14 x 4-6 cm; oval-elliptic; leathery; apex acute to shortly acuminate; base slightly rounded, oblique; green, hairless above; pubescent, whitish beneath; margin denticulate; 13-15 vein pairs; tertiary veins slender, evident beneath; petiole glabrous, sulcate, 1.5-2 cm long;
Fruits acorn 1.7 cm long, 1.2 cm wide; ovoid-ellipsoid; shiny reddish brown; enclosed 1/2 or 1/3 by cup; cup thin (1 mm), whitish tomentose outside, with 4-5 concentric rings denticulate at margin; scar 7 mm in diameter, convex; stylopodium persistent; maturing in 1 year;

Bark, twigs and

twigs stout, hairless, greyish brown, with a few grey lenticels;
Hardiness zone, habitat mixed mountain forests;
Miscellaneous -- Sub-genus Cerris, Section Cyclobalanopsis;
-- Close to
Q.argyrotricha from which it differs in having larger leaves less acuminate, twigs glabrous, cup with whitish hairs instead of yellow ones, and only 4-5 concentric rings on the cup;

Subspecies and