Dipterocarpus borneensis (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus borneensis v. Slooten

Protologue: Bull. Jard. Bot. Buitenzorg, sér. 3, 16: 445, f. 6 (1940).

Vernacular names

• Brunei: keruing sindor (Malay), resak kerangas (Iban)
• Indonesia: keruing daun halus (general), awang buah (East Kalimantan), tempudau (South Kalimantan)
• Malaysia: keruing sindor (Sarawak).

Distribution

Eastern coastal Sumatra and Borneo (Kalimantan, Sarawak, Brunei).

Uses

The timber is used as keruing, but is very resinous.

Observations

• A medium-sized tree of up to 30 m tall, bole often of poor shape, up to 64 cm in diameter and with low, rounded buttresses, bark surface with corky pustules, pale orange-brown, tending to turn pale greyish-white; buds ovoid, densely pinkish buff pubescent.
• Leaves broadly ovate to elliptical, 7-12 cm × 3-7 cm, base obtuse or broadly cuneate, acumen to 8 mm long, secondary veins 9-12 pairs, lower surface sparsely shortly caducous pubescent on the veins, petiole 1.5-2.5 cm long, sparsely pubescent, stipules linear, acute; stamens about 25.
• Fruit calyx tube narrowly ovoid to ellipsoid, with 5 narrow wings, glabrous, 2 larger fruit calyx lobes up to 7.5 cm × 1.8 cm, 3 shorter ones about 5 mm × 4 mm.

D. borneensis is widespread but owing to its edaphic preferences mainly subcoastal. It occurs in heath forest on podzols or giant podzols below 350 m altitude. The density of the wood is 690-900 kg/m³at 15% moisture content.

Selected sources

30, 31, 258, 748.

Main genus page

• Dipterocarpus (Timbers)

Authors

• T. Smitinand (selection of species),
• C. Phengklai (selection of species),
• L.E. Groen (selection of species)