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Quercus langbianensis | |
Author | Hickel & A.Camus 1921 Ann. Sci. Nat., Bot. X, 3: 382 |
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);
1000-2000 m; |
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,
not undulate, with small, obtuse teeth in apical 1/3; green, shiny, hairless
above; hairless, nearly concolor beneath; midrib slightly raised adaxially,
prominent below; 10-12 pairs of secondary veins at an angle of 40°
from midrib; tertiary veins evident abaxially; petiole 1-2 cm, initially
pubescent, then hairless; |
Flowers | |
Fruits | acorn
2.5-3.8 cm long, 1.8-2 cm wide, obovoid to ellipsoid; pale brown, densely
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, nearly entire, 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 Cerris, Section Cyclobalanopsis; -- Section Semiserrata, sub-section Semiserratae (Menitsky). -- Threatened (IUCN Red List Category : CR) -- In 2018, H.T. Binh & al. consider a "Q. langbianensis Complex" - mature leaf 12-17 cm long, 3-5 cm wide, margin serrate from apical 1/3 to apical 5/6, acute to acuminate apex, cuneate or attenuate base, young leaves hairy but almost hairless once mature; - acorn ovoid or globose or ellipsoid, 1/4 to 2/3 enclosed The |
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