Dipterocarpus eurynchus (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Dipterocarpus eurynchus Miq.

Protologue: Fl. Ind. Bat., Suppl. 1 (Prodr. Fl. Sum.): 485 (1861).

Synonyms

• Dipterocarpus appendiculatus R. Scheffer (1870),
• Dipterocarpus eurynchoides R. Scheffer (1870),
• Dipterocarpus basilanicus Foxw. (1918).

Vernacular names

• Brunei: keruing baran
• Indonesia: keruing minyak (general), ansang ansang, keruing senium (Sumatra)
• Malaysia: keruing baran, keruing padi (Peninsular)
• Philippines: basilan apitong (general).

Distribution

Peninsular Malaysia, Sumatra, Borneo and the southern Philippines.

Uses

D. eurynchus supplies a general-purpose keruing timber.

Observations

• A medium-sized to very large tree of up to 65 m tall, bole tall, straight or twisted, up to 110 cm in diameter, buttresses low, rounded, bark surface pale greyish-brown, irregularly cracked and flaked, inner bark hard, sapwood cream, hard, merging to the reddish-brown heartwood; buds conical, buff tomentose.
• Leaves elliptical to obovate, 4-6(-10) cm × 2-3.5(-4.5) cm, base cuneate, apex subacute to shortly acuminate, secondary veins 8-9 pairs, sparsely pubescent beneath, petiole 0.5-1 cm long, stipules narrowly oblong, subacute, persistently pale grey-brown pubescent.
• Fruit calyx tube glabrous, 5-winged, wings c. 2.5 mm wide, 2 larger fruit calyx lobes up to 8 cm × 2 cm, 3 shorter ones up to 7 mm × 5 mm.

D. eurynchus is a polymorphic, comparatively rare and local species, and occurs on leached clay soils, undulating land and ridge tops in mixed dipterocarp forest up to 700 m altitude. The density of the wood is 590-800 kg/m³at 15% moisture content.

Selected sources

30, 140, 461, 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)