Dipterocarpus kunstleri (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus kunstleri King

Protologue: Journ. As. Soc. Beng. 62(2): 96 (1893).

Synonyms

• Dipterocarpus speciosus Brandis (1895),
• Dipterocarpus exalatus v. Slooten ex Wood (1960).

Vernacular names

• Brunei: keruing kuntum puteh
• Indonesia: keruing lagan (Kalimantan, Sumatra), lagan laweh daun (Sumatra), kambalong (Kalimantan)
• Malaysia: keruing gombang merah (general), keruing rapak (Sabah), keruing salatus (Peninsular)
• Philippines: broad-winged apitong, broadleaf apitong (general), hagakhak (Tagalog).

Distribution

Peninsular Malaysia, Sumatra, Borneo and the Philippines.

Uses

The timber is used as keruing. Wood-oil can be obtained from the bole.

Observations

• A small to fairly large tree of up to 40 m tall, bole straight but tending to branch low, up to 100 cm in diameter, buttresses usually few and small, up to 1 m tall, up to 1 m long, rather thin, bark surface brown or pale orange-brown, rarely grey, thinly flaky, outer bark thin (2.5 mm), inner bark red-brown grading inwards to yellowish-brown, sapwood pale brown to yellowish, heartwood dark brown; buds narrowly falcate, pale grey adpressed puberulent.
• Leaves elliptical to broadly lanceolate, 13-22 cm × 7-10 cm, base cuneate, apex shortly acuminate, secondary veins 16-18 pairs, beneath glabrous or puberulent, petiole 2-3 cm long, stipules linear, outside densely minutely puberulent.
• Stamens 30.
• Fruit calyx tube glabrous, ellipsoid, 5-ribbed or almost winged, 2 larger fruit calyx lobes up to 11 cm × 1.5 cm, very variable in length, sometimes no longer than the shorter ones, 3 shorter ones to 6 mm × 5 mm.

D. kunstleri is widespread and locally common on undulating or flat land, especially on clay alluvium. The density of the wood is 510-890 kg/m³ at 15% moisture content. See also the table on wood properties.

Selected sources

30, 31, 102, 140, 175, 253, 258, 297, 306, 417, 461, 476, 514, 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)