Dipterocarpus validus (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus validus Blume

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

Synonyms

• Dipterocarpus affinis Brandis (1895),
• Dipterocarpus warburgii Brandis (1895),
• Dipterocarpus lasiopodus Perkins (1904).

Vernacular names

• Indonesia: kambong, kaladan (south-eastern Kalimantan)
• Malaysia: keruing kasugoi (Sabah)
• Philippines: hagakhak (general), anahauon (Bikol), kamuyau (Ibanag).

Distribution

Borneo and the Philippines; also as a plantation tree in the Philippines.

Uses

D. validus supplies a general-purpose keruing timber. Wood-oil exudes copiously from the bole.

Observations

• A medium-sized or large tree of up to 50 m tall, bole branchless for up to 30 m, up to 175 cm in diameter, buttresses frequent on older trees, blunt or thin, up to 2.5 m tall and 1.5 m long, bark surface smooth, on older trees scaly, pale yellowish-brown or grey; buds lanceolate, rufous tomentose.
• Leaves elliptical-oblong to ovate, 15-25 cm × 7.5-12 cm, base cuneate to obtuse, apex acute to acuminate with an up to 1 cm long acumen, secondary veins 22-28 pairs, straight, beneath sparsely puberulent, petiole 3.5-5 cm long, stipules lorate, outside densely long rufous tomentose.
• Stamens about 30.
• Fruit calyx tube turbinate, smooth, glabrous, 2 larger fruit calyx lobes up to 25 cm × 3.5 cm, 3 shorter ones up to 6 mm × 6 mm.

D. validus is common and frequently gregarious both in primary and secondary forest and occurs on flat land, in freshwater swamp and on river banks or occasionally on low hills up to 300 m altitude. The density of the wood is 720-870 kg/m³ at 15% moisture content.

Selected sources

175, 258, 476, 579, 746, 748.

Main genus page

• Dipterocarpus (Timbers)

Authors

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