Oaks of the World

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  Quercus rupestris
Author Hickel & A.Camus 1923 Bull. Mus. Natl. Hist. Nat. 29: 599
Local names
Range Vietnam; 600-900 m;
Growth habit 5-6 m tall;
Leaves 4-8 x 1.5-3 cm; leathery; sub-elliptical, oblong-lanceolate or oval-oblong; both ends attenuate; base cuneate; apex obtuse; margin entire, sometimes undulate-dentate near apex; shiny, glabrous above; dull and glabrous beneath; 5-7 vein pairs slightly raised beneath, at an angle of 40-45° with the midrib; petiole 1 cm long, glabrous; 
Flowers 3 very short styles, basally connate; very small stigmas;
Fruits acorn 1.5-1.8 cm long, 1.3-1.5 cm in diameter, mucronate, hairy, basal scar flat or slightly depressed; often paired on a 0.5-1 cm long peduncle; covered at base only by cup; cup stalkless 0.8-1.3 cm in diameter, with 6 entire or slightly undulate-denticulate rings; annual;

Bark, twigs and

young shoot hairless, rough, with lenticels; bud rounded, 2 mm in diameter, with oval, slightly hairy scales;
Hardiness zone, habitat not hardy; tropical forests; prefers rocky soils;
Miscellaneous -- A. Camus : tome 1, p. 299, n° 53;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Glauca, sub-section Glaucae (Menitsky);
-- Threatened (IUCN Red List Category : EN).

Subspecies and