Oaks of the World

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  Quercus yonganensis
Author L.G.Lin & C.C Huang 1991
Synonyms Cyclobalanopsis yonganensis (Lin & Huang) Hsu & Jen 1993
Local names yong an qing gang;
Range China (Fujian) ; 1000-1400 m ;
Growth habit reaches 20 m tall;
Leaves 13-18 x 4-6 cm; lanceolate to oblong; chartaceous, thick; apex acuminate; base slightly truncate or sometimes auricled; margin denticulate; concolorous when young, becoming glaucous and hairless beneath; midrib impressed adaxially; 14-17 vein pairs; tertiary veins reticulate; petiole 2.5-4 cm long;
Flowers  
Fruits acorn 1.4-1.8 cm long, 1.2-1.8 cm in diameter; ovoid or subglobose; cup 0.6-1.2 cm long, 1.4-1.8 cm wide, with 6-7 concentric rings covered outside with yellowish brown hairs; margin of rings entire (except the 2-3 basal ones that are irregularly denticulate); cup densely tomentose inside ; scar 6-11 cm in diameter;

Bark, twigs and
buds

twigs brown-purple, thick;
Hardiness zone, habitat not hardy;
Miscellaneous -- Sub-genus Cyclobalanopsis;
Subspecies and
varieties
 
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