Oaks of the World

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  Quercus langbianensis
Author Hickel & A.Camus 1921
Synonyms baniensis A.Camus 1936 (A. Camus : n 28)
blaoensis A.Camus 1935 (A. Camus : n 27)
cambodiensis Hick. & A.Camus 1923 (A. Camus : n 10)
langbianensis subsp cambodiensis (Hickel & A. Camus) Menitsky 1976
camusiae Trel. ex Hickel & A.Camus 1929 (A. Camus n 25)
Cyclobalanopsis camusiae (Trel. ex Hickel & A.Camus) Y.C. Hsu & H.W. Jen 1993
pachyloma var. mubianensis Y.C. Hsu & H.W. Jen 1976
Cyclobalanopsis pachyloma var. mubianensis (Y.C. Hsu & H.W. Jen) C.C. Huang 1992
dilacerata Hick. & A.Camus 1928 (A. Camus : n 16)
donnaiensis A.Camus 1935 (A. Camus : n 5)
geminata Hickel & A.Camus 1923, nom. illeg., non Small 1897
Cyclobalanopsis faadoouensis Hu 1951
Local names fa dou qing gang;
Range Vietnam (Annam, where it is abundant); Cambodia; China (SE Yunnan, W Guangxi); 1000-2000m;
Growth habit 7-10 m usually, but may reach 25-28 m;
Leaves 7-14 x 2.5-4 cm; coriaceous; oblong-lanceolate; both sides glabrous; apex attenuate, acuminate to shortly caudate; base cuneate or oblique; margin thickened, entire, often wavy, with small, obtuse teeth near apex; green, shiny, hairless above; hairless, nearly concolor beneath; midrib slightly raised adaxially, prominent below; 9-12 pairs of secondary veins; tertiary veins evident abaxially; petiole 1.5-2 cm, initially pubescent, then hairless; 
Fruits acorn 1.5-3 cm long, 1.8 cm wide, subglobose or oblong; pale brown, silky, scar convex 1 cm wide; enclosed 1/3 by cup; cup sessile, less than 1.6 cm long and 2 cm wide, very thick (wall 3 mm), rusty tomentose, with 6-9 broad, dentate, pubescent rings; stylopodium persistent ; maturing first year in September; kernel edible; 

Bark, twigs and

bark rough, dotted; twig initially pubescent, becoming glabrous; 
Hardiness zone, habitat not hardy; prefers wet, peaty soils;
Miscellaneous -- A. Camus : n 7;
-- Sub-genus Cyclobalanopsis;
-- Section Semiserrata, sub-section Semiserratae (Menitsky).
-- related to
Subspecies and

is a subspecies for Menitsky
= Q.langbianensis subsp cambodiensis (Hick.
& A. Camus) Menitsky 1976
leaves oval-oblong, 10 cm long, 3 cm wide; apex obtuse, base cuneate; margin weakly toothed near apex or often only crenate; petiole hairy 2 cm long; 9 vein pairs; acorn ovoid, 3 cm long, 1.8-2 cm across, yellowish silky pubescent, with basal scare flat; cup sessile twice as wide as height, covering 1/5 to 1/4 of the acorn, with 7 concentric, yellowish pubescent rings, the lower ones dentate; Cambodge;
For today's Authors (Min Deng, Z.K. Zhou, A. Coombes, 2010) it is a synonym of Q. langbianensis.