Dipterocarpus elongatus (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus elongatus Korth.

Protologue: Temminck, Verh. Natuurl. Gesch. Ned. Overz. Bez., Botanie, Kruidk.: 62 (1841).

Synonyms

• Dipterocarpus apterus Foxw. (1932).

Vernacular names

• Brunei: keruing latek (Malay), ran (Iban, Dusun), kudan (Murut)
• Indonesia: keruing tempudau (Kalimantan), keruing pasir (Sumatra)
• Malaysia: keruing latek (Peninsular, Sarawak), keruing kasugoi (Sabah), keruing gumbang (Peninsular).

Distribution

Peninsular Malaysia, Sumatra and Borneo.

Uses

The timber is used as keruing. The fruits are boiled and eaten as a vegetable.

Observations

• A large to very large tree of up to 60 m tall, bole straight, cylindrical, up to 175 cm in diameter, buttresses large, straight, up to 3 m tall, up to 2 m long, c. 20 cm thick, bark surface pale greyish, appearing smooth, sapwood pale pink-brown, heartwood darker; buds falcate, with a long red-brown tufted tomentum, sometimes glabrescent.
• Leaves elliptical, 28-50 cm × 13-20 cm, base obtuse, apex shortly abruptly acuminate, secondary veins 25-38 pairs, beneath sparsely tomentose to glabrous, petiole 5-7 cm long, stipules hastate, acute, tufted tomentose outside.
• Fruit calyx tube at first obovoid, later globose, with 5 obtuse distal tubercles, at first tomentose, later glabrescent, fruit calyx lobes equal, vestigial, up to 8 mm long, becoming recurved, obtuse.

D. elongatus occurs in freshwater swamps, usually on sandy, periodically inundated soils at low altitude and is locally common in both primary and secondary forest. The density of the wood is 500-760 kg/m³at 15% moisture content. See also the table on wood properties.

Selected sources

30, 31, 89, 102, 140, 253, 258, 461, 677, 737, 746, 748.

Main genus page

• Dipterocarpus (Timbers)

Authors

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