Oaks of the World

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  Quercus kouangsiensis
Author A.Camus 1937 Bull. Soc. Bot. France 84: 176
Synonyms Cyclobalanopsis kouangsiensis (A.Camus) Y.C.Hsu & H.Wei Jen 1976
Cyclobalanopsis macrocalyx var. tomentosa Metcalf 1942
nemoralis Chun 1947
Local names guang xi qing gang
Range China (Hainan, Guangxi) ;700-900 m ;
Growth habit 12-15 m;
Leaves 12-18 cm x 3-6 cm; leathery; ovate or oblong-elliptic; base cuneate, apex acute; margin entire or apical 1/3 dentate or denticulate; densely tomentose beneath (stellate, pale greyish brown tomentum); 10-14 vein pairs, prominent above, straight, reaching margin; petiole 1.5-3 cm, densely light brown tomentose;
Flowers pistillate inflorescences 1.5 cm, with brown tomentose rachis, from March to April;
Fruits acorn 3-4.5 cm long, 2.5 cm wide; ovoid to cylindrical; silky at first, then glabrous ; apex rounded, base more or less convex; basal scar 1.5 cm in diameter; enclosed 1/2 or more by cup; cup campanulate, 2-3 cm high, 2-2.8 cm wide, tawny tomentose outside, silky inside, 1.6-3 mm thick, scales in 8-9 concentric rings with margin entire or denticulate; maturing in 2 years, in October-December;

Bark, twigs and

twig sulcate, densely tomentose;
Hardiness zone, habitat not hardy;
Miscellaneous -- A. Camus : tome 1, p. 180, n 1 bis;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Semiserrata, sub-section Semiserratae (Menitsky).
-- Threatened (IUCN Red List Category : EN).

-- Closely related to
Q.pachyloma ;
-- Differs from
Q.macrocalyx in having a thinner cup with fewer concentric rings, a bigger basal scare, leaves tomentose beneath and remotely denticulate in apical half (whereas Q.macrocalyx has hairless, entire, apicaly acuminate leaves).

Subspecies and