-- Oaks of the World

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  Quercus gemelliflora
Author Blume 1825 Verh. Batav. Genootsch. Kunsten 9: 222
Synonyms Cyclobalanopsis gemelliflora (Bl.) Oerst. 1867
crassilamellata (Gamble) A.Camus 1931 (A. Camus : n° 21)
horsfieldii MiQ.1856
lineata var. merkusii (Endl.)Wenzig 1886
merkusii Endl. 1848
semiserrata var. mannii Hook.f. 1888
turbinata Bl. 1826 (A. Camus = n° 12)
turbinata var. crassilamellata Gamble 1915
Local names
Range Borneo, Java, Sumatra, W Malaysia; 600-2000 m;
Growth habit tall tree 30 m and more; trunk to 0.60m in diameter;
Leaves 15-17 x 3 cm; thin, chartaceous; lanceolate to oval-lanceolate ; apex acute, acuminate or caudate; base acute or attenuate, often asymmetrical; margin plane, serrulate towards apical 1/2; glabrous above; glabrescent beneath; 8-10 pairs of secondary veins weakly raised below, forming an angle of 40° with the midrib; petiole tomentose 1-4 cm long, flat above, glabrescent;
Flowers male catkins many-flowered, 3-6 cm long, hairy ; male flowers single or to 3, perianth 3-6-lobed, hairy, 3-6 stamens; female inflorescence 2-7-flowered, perianth 4-6-lobed, hairy, 0-6 staminodes, 4-6 styles 1-2 mm long;
Fruits acorn conical, 2-5 cm long, with obtuse apex and rounded base; most often paired along rachis; subsessile or on a short peduncle; cup enclosing 1/3 to 1/2 of nut, with 6-8 brownish, pubescent, denticulate rings;

Bark, twigs and

greyish brown bark, smooth or finely fissured; young shoot pubescent becoming hairless;  terminal buds ovoid or subglobose; stipules linear, acute, hairy, 5-10 mm long;
Hardiness zone, habitat not hardy; wet mixed forests; 
Miscellaneous -- A. Camus : tome 1, p. 363, n° 81;
-- Sub-genus Cerris, Section Cyclobalanopsis;
-- Section Semiserrata, sub-section Gemelliflorae (Menitsky).
-- Strongly variable species (shape of leaves, pubescence of twigs, acorn);
-- For A.Camus, Q. horsfieldii Miq. is a synonym of Q. semiserrata;

Subspecies and