Dipterocarpus hasseltii (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus hasseltii Blume

Protologue: Fl. Java 2: 22, t. 6 (1829).

Synonyms

• Dipterocarpus tampurau Korth. (1841),
• Dipterocarpus balsamiferus Blume (1852),
• Dipterocarpus subalpinus Foxw. (1913).

Vernacular names

• Indonesia: keruing bunga (general), jempinang (Java), keruing tampudan (Kalimantan)
• Malaysia: keruing ropol, keruing laut (Peninsular), keruing kerukup kechil (Sabah)
• Philippines: Hasselt's panau, Palawan panau, highland panau (general)
• Thailand: yang-kliang, yang-tai (general), yang-man-sai (peninsular)
• Vietnam: dầu rái.

Distribution

Vietnam, peninsular Thailand, Peninsular Malaysia, Sumatra, Java, Bali, Borneo and the Philippines.

Uses

D. hasseltii is an important source of keruing timber. The wood-oil is frequently collected and used locally for caulking boats, varnish and illumination.

Observations

• A large tree of up to 45 m tall, bole strongly tapering, up to 150 cm in diameter, buttresses flattish, bark surface greyish-green, outer bark thin, inner bark pinkish to red-brown, sapwood ochre, heartwood red-brown; buds falcate-lanceolate, glabrous.
• Leaves elliptical, 9-16 cm × 5-10 cm, base cuneate, acumen up to 1 cm long, secondary veins 11-14 pairs, ascending, glabrescent or the veins beneath sparsely puberulent, margin more or less prominently crenate, petiole 2.5-4 cm long, stipules lorate-lanceolate, subacute, glabrous.
• Stamens 30.
• Fruit calyx tube subglobose, smooth, 2 larger fruit calyx lobes up to 22 cm × 3 cm, 3 shorter ones up to 15 mm × 13 mm.

D. hasseltii occurs mostly on well-drained but moist fertile red soils in lowland dipterocarp forest in valleys and on hillsides, up to 600 m altitude. The density of the wood is 500-980 kg/m³at 15% moisture content. See also the table on wood properties.

Selected sources

35, 102, 140, 162, 175, 189, 253, 258, 318, 461, 476, 514, 628, 677, 737, 748, 761.

Main genus page

• Dipterocarpus (Timbers)

Authors

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