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Quercus kerangasensis | |
Author | Soepadmo 1966 Gard. Bull. Singapore 22: 399 |
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 |
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 | -- Sub-genus Cerris,
section Cyclobalanopsis; -- Section Oidocarpa Menitsky; subsection Oidocarpae ; -- Threatened (IUCN Red List Category : VU). |
Subspecies and varieties |
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Pictures |