Oaks of the World

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  Quercus austrocochinchinensis
Author Hickel & A.Camus 1921 Ann. Sci. Nat., Bot. X, 3: 386 1921.
Synonyms Cyclobalanopsis austrocochinchinensis (Hick. & A.Camus) Hjelmquist 1968
Local names yue nan qing gang;
Range Thailand, Vietnam, Laos, China (Yunnan) ; from 700 to 1000 m ;
Growth habit 15-20 m tall; trunk reaching 1 m in diameter;
Leaves 10-15 x 3-5 cm; leathery, stiff; oblong-elliptic to lanceolate; apex shortly pointed or acuminate; base cuneate; young leaves pubescent both sides, mature leaves glabrous; bright green above; margin slightly undulate, with 2-6 pairs of short, blunt teeth along apical half; 10-15 pairs of lateral veins slightly raised above, prominent beneath; tertiary veins evident abaxially; petiole to 1-2 cm, with stellate hairs, becoming glabrous;
Flowers female inflorescences few-flowered ; flowers hairy, rusty, with  4-5 styles ;
Fruits acorn 1.3-1.8 in diameter x 1-1.4 cm long; flattened, with base truncate; yellow brown silky tomentose; enclosed completely or nearly so (except apex) in thin (2 mm), tomentose (inside and outside) cup; cup with 7-9 concentric, denticulate rings ; scar on the whole base of nut, convex; stylopodium persistent; maturing in 1 year;

Bark, twigs and

bark pale grey, somewhat whitish; branchlets yellowish, stellate-haired but glabrescent, with numerous oblong lenticels; small bud, globose, 2-3 mm wide, with 4 pairs of rounded scales
Hardiness zone, habitat not hardy; scattered in mountain forests and along streams;
Miscellaneous -- A. Camus : tome 1, p. 350, n° 74;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Helferiana, sub-section Helferianae (Menitsky);
-- Threatened (IUCN Red List Category : VU).
-- Closely related to
-- Hybridizes with Q. kerrii;

Subspecies and

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