Oaks of the World

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  Quercus kerangasensis
Author Soepadmo 1966
Synonyms  
Local names  
Range Borneo; 0 to 100 m ;
Growth habit 20-30 m; trunk to 0.5 m in diameter;
Leaves 4-11 cm x 2-4; coriaceous; elliptic-lanceolate; apex acute or acuminate; base attenuate acute; margin entire; adaxially glossy, glabrous; abaxially glaucous, hairless except on midvein; 7-10 vein pairs, nearly parallel, forming an angle of 60-70° with the midrib, slightly raised above, prominent below; petiole 8-12 mm long, glabrescent, flat or slightly furrowed above;
Flowers in June; male catkins 1-2 cm long, pubescent; male flowers with membranous perianth, stamens 1-2 mm;
Fruits

acorn ovoid-conical or cylindrical, 1.2-1.5 cm, glabrescent, base convex; cup obconical, densely brownish tomentose, with 5-7 concentric, entire or denticulate, rings; ripe in September;

Bark, twigs and
buds

bark grey, more or less smooth; twig initially densely stiff-pubescent, late glabrescent, greyish brown, with numerous warted lenticels; bud ovoid-globose 3-6 mm long; stipules linear, acute, 2-3 mm long;
Hardiness zone, habitat primary heath ("kerangas") forests;
Miscellaneous -- Subgenus Cyclobalanopsis;
-- Section Oidocarpa Menitsky; subsection Oidocarpae ;
Subspecies and
varieties
 
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