Dipterocarpus hasseltii (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus hasseltii Blume

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

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

• 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.

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

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

• 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.

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

• Dipterocarpus (Timbers)

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