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/m³at 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.