Oaks of the World

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  Quercus obconica
Author Y.C.Hsu & Z.K.Zhou 1998 Acta Bot. Yunnan. 20: 43
Synonyms Cyclobalanopsis macrocalyx var. litoralis (Hsu & Jen) M.Deng & Z.K.Zhou 2005
Cyclobalanopsis litoralis Chun & Tam ex Hsu & Wei Jen 1979
hainanica Huang & Chang 1982, nom. inval.
Local names jian feng qing gang ;
Range China (Hainan); 700-900 m ;
Growth habit reaches 15 m tall, trunk to 0,4 m in diameter;
Leaves 8-15 x 4-10 cm; ovate to obovate ; leathery; apex obtuse or shortly pointed; base cuneate; margin entire or weakly denticulate near apex; greyish green beneath, tomentose at first then hairless;  6-9 curved vein pairs slightly raised above, as for the midrib; tertiary veins inconspicuous abaxially; petiole 2.5-5 cm, densely tomentose at first;
Flowers March to May; pistillate inflorescences 2-3 cm long, at axil of terminal leaves;
Fruits acorn 3-4.5 cm long, 2.2-2.8 cm wide, ovoid to cylindrical; apex rounded to deprimate; 3 to 5 together; enclosed 1/2 or 1/3 by cup; cup 3-5 mm thick, 2-3 cm high, 2.5-3 cm wide, tomentose outside, silky inside, with 9-12 concentric rings; basal rings always entire, others may be dentate; maturing in 2 years from October to December;

Bark, twigs and

bark greyish brown; twigs thick, at first densely tomentose, becoming glabrous, with small raised lenticels;
Hardiness zone, habitat not hardy;

-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Differs from
C.  macrocalyx in having  fewer secondary veins, and ovate or obovate, thick, leathery leaves.
-- Threatened (IUCN Red List Category : EN)
-- For The Plant List 2013, it is a synonym of Q. hainanica
C.C. Huang & Y.T. Chang ex Govaerts & Frodin 1998, the name which must be applied to this taxon, because they think that Q. obconica (or obconicus) is an illegitimate name, and moreover Cyclobalanopsis litoralis and C. macrocalyx var. litoralis are not adapted since Cyclobalanopsis' taxa are actually section of Quercus subgenus Cerris.

-- Sometimes written "obconicus"

Subspecies and
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