Dipterocarpus oblongifolius (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus oblongifolius Blume

Protologue: Mus. Bot. Lugd.-Bat. 2: 36 (1852).

Synonyms

• Dipterocarpus stenopterus Vesque (1874),
• Dipterocarpus pulcherrimus Ridley (1893).

Vernacular names

• Brunei: keruing neram (Malay), ensurai (Iban), kesugoi (Murut, Dusun)
• Indonesia: (b)ansurai (West Kalimantan)
• Malaysia: keruing neram (general), denderam (Peninsular), ensurai (Sarawak)
• Thailand: yang-khlong (general).

Distribution

Peninsular Thailand, Peninsular Malaysia and Borneo.

Uses

The timber is used as keruing; it is used locally for large padi-husking tables.

Observations

• A small or medium-sized tree of up to 35 m tall, bole often gnarled and twisted, up to 190 cm in diameter, bark surface pale grey, inner bark pink-brown, sapwood pinkish, heartwood soft, deep pink; buds linear, pale yellow tomentose.
• Leaves narrowly elliptical to lanceolate, 14-18(-25) cm × 4-7(-9) cm, base cuneate, apex gradually tapering, acumen up to 1 cm long, slender, secondary veins 16-20 pairs, below densely more or less caducously tomentose, petiole 1.5-2 cm long, stipules linear, obtuse, outside pale yellow tomentose.
• Stamens 15.
• Fruit calyx tube narrowly obovoid or fusiform, with 5 wavy, narrow wings, 2 larger fruit calyx lobes 10-12 cm × 1.5 cm, 3 shorter ones about 10 mm × 3 mm.

D. oblongifolius grows gregariously on the banks of fast-flowing inland rivers. Seeds germinate and seedlings become established below the flood-line. The density of the wood is 625-850 kg/m³ at 15% moisture content.

Selected sources

30, 31, 89, 102, 124, 140, 253, 258, 476, 514, 515, 602, 628, 677, 737, 748.

Main genus page

• Dipterocarpus (Timbers)

Authors

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