Dipterocarpus costulatus (PROSEA)

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Plant Resources of South-East Asia
List of species

Dipterocarpus costulatus v. Slooten

Protologue: Bull. Jard. Bot. Buitenzorg, sér. 3, 8: 315, f. 7 (1927).

Vernacular names

  • Brunei: keruing kipas
  • Indonesia: keruing bajan (Sumatra, Kalimantan), keruing ladan, kyakat (West Kalimantan)
  • Malaysia: keruing kipas (general), keruing marah keluang (Peninsular), kerubang (Sabah).


Peninsular Malaysia, Sumatra and Borneo.


D. costulatus is an important source of keruing.


  • A large tree of up to 50 m tall, bole branchless for up to 35 m, up to 127 cm in diameter, buttresses rounded, up to 1.5 m tall, up to 1 m long, stout, bark surface grey or pale greenish-cream, uneven, but overall smooth, outer bark brown, inner bark dark pinkish ochre-brown to lighter ochre, sapwood light yellow-ochre, heartwood ochre-brown; buds falcate, glabrous and frequently pruinose.
  • Leaves broadly elliptical to ovate, 12-20 cm × 7-14 cm, base prominently cuneate, apex obtuse to shortly acuminate, persistently folded between the 11-14 pairs of secondary veins, glabrous, petiole 3-6 cm long, stipules lorate, subacute, shortly buff pubescent outside.
  • Stamens 24.
  • Fruit calyx tube glabrous, subglobose, with 5 prominent flange-like tubercles, 2 larger fruit calyx lobes up to 20 cm × 4 cm, 3 shorter ones up to 7 mm × 6 mm.

D. costulatus occurs locally, on poor, often sandy soils on flat and undulating or sometimes periodically inundated land up to 600 m altitude. The density of the wood is 800-980 kg/m3at 15% moisture content.

Selected sources

31, 258, 476, 514, 677, 737, 748.

Main genus page


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