Quercus rupestris Hickel & A.Camus

Vietnam; 600-900 m;

5-6 m tall;

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;

3 very short styles, basally connate; very small stigmas;

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;

not hardy; tropical forests; prefers rocky soils;

– 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).