General data | Classifications | List of species | Local names | Back to home page |
Quercus percoriacea | |
Author | Soepadmo 1966 Gard. Bull. Singapore 21: 382 |
Synonyms | |
Local names | |
Range | Borneo (north
Sarawak); to 1200 m; |
Growth habit | tall tree to
30 m., with trunk to 0.5 m in diameter; |
Leaves | 10-18 cm x 4-8;
thick, strongly coriaceous; oval or elliptic; apex long acuminate; base
rounded; margin entire, plane, undulate in the lower half, remotely crenate
dentate at apical 1/2; glabrous and shining above; glaucous beneath from
waxy coat and small stellate hairs, glabrescent; 10-12 vein pairs, prominent
beneath, impressed above, parallel, forming an angle of 40-60° with
the midvein; petiole 2-3.5 cm long, slightly grooved adaxially, glabrous; |
Flowers | male catkins 5-6 cm long, many-flowered, densely stellate tomentose; male flowers 3-4 together along rachis, perianth 5-6-lobed, 5-6 stamens; female inflorescences 1 cm with 2-4 flowers, tomentose; female flowers with perianth 4-5-lobed, hairy, ovary conical, 3-4 styles; |
Fruits | acorn 2 cm in diameter, ovoid to globose, apex depressed, with basal scar convex; cupule rather flat, covering 1/6 to 1/5 of nut, with 6-8 denticulate or not rings; from June to July; |
Bark, twigs and |
bark
smooth, grey; twig grey, glabrescent, with lenticels; terminal bud ovoid
to subglobose, 3 mm long, densely tomentose; |
Hardiness zone, habitat | primary "kerangas" (heath) forests on plateau sands; not hardy; |
Miscellaneous | -- Sub-genus Cerris, Section
Cyclobalanopsis; -- Section Oidocarpa, sub-section Niveae (Menitsky). -- Closely related to Q.nivea (if not identical ?); -- Threatened (IUCN Red List Category : EN). |
Subspecies and varieties |
|
Pictures |