Oaks of the World

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 Quercus jenseniana
AuthorHand.-Mazz. 1922
Synonyms Cyclobalanopsis jenseniana (Hand.-Mazz.) Cheng & Hong ex Q.F.Zheng 1982
Cyclobalanopsis pinbianensisY.C. Hsu & H.Wei Jen 1976
pinbianensis (Hsu & Wei Jen) Huang & Chang 1992
Lithocarpus jensenianus (Hand.-Mazz.) Chun & Metcalf 1942
Lithocarpus dunnii F.P.Metcalf 1931
Local namesda ye qing gang
Range SW and Central China (Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Yunnan, Zhejiang); 300-1700 m;
Growth habit10-20 m tall, may reach 35 m;
Leaves 12-25 x 6-12 cm; elliptic, oblong-elliptic or oboval-oblong; remaining 2 years; subleathery; apex acuminate to caudate ; base cuneate, sometimes subrounded; margin entire, sometimes wavy; both sides glabrous; 12-20 vein pairs; petiole hairless, 3-5 cm long, sulcate beneath;
FlowersApril to June, on female inflorescences 5-10 cm long;
Fruits acorn 1.7-2 cm long, 1.3-1.5 cm wide; light brown; yellowish velutinous; thin cup 1.3 cm in diameter, densely tomentose inside, glabrescent outside, enclosing 1/2 or 1/3 of nut, with 6-9 concentric rings denticulate at rim; scar 4-6 mm wide, convex; stylopodium persistent; maturing in 2 years;

Bark, twigs and
buds

twig thick, sulcate, hairless, with numerous pale brown lenticels;
Hardiness zone, habitatnot hardy; forests on mountain slopes, valleys, along streams;
Miscellaneous -- A. Camus : n° 55;
-- Sub-genus Cyclobalanopsis, section Cyclobalanoides (Menitsky).
-- closely related to
Q.argentata Korth.;
-- For Govaerts, 2007, Q. pinbianensis is a true species, in Yunnan.
Subspecies and
varieties
 
Pictures

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