Hopea nervosa (PROSEA)

Plant Resources of South-East Asia Introduction

List of species

Hopea nervosa King

Protologue: Journ. As. Soc. Beng. 62(2): 124 (1893).

• Brunei: merawan jangkang
• Indonesia: selangan puteh, selangan bertunjang, damar jangkar (south-eastern Kalimantan)
• Malaysia: merawan jangkang, chengal rawan (Peninsular), selangan jangkang (Sabah).

Peninsular Malaysia and Borneo.

The timber is used as merawan.

• A medium-sized tree of up to 30 m tall, bole small, cylindrical, frequently crooked, with a diameter of up to 75 cm, buttresses usually prominent and stilted, exuding a white dammar, bark surface smooth, inner bark thin, soft, pale cream-brown, sapwood white, becoming pale brown within, soft; young parts and midrib of leaves on both surfaces caducous puberulent.
• Leaves narrowly ovate to lanceolate, 9-18 cm × 4-7 cm, thin leathery, base broadly cuneate, acumen narrow, up to 1.4 cm long, venation scalariform, midrib slightly depressed above, secondary veins 13-15 pairs, dense, slender, prominent beneath, ascending at 40-60°, with or without short slender veins in between.
• Stamens 15, ovary and stylopodium broadly cylindrical, truncate, style short.
• 2 longer fruit calyx lobes up to 12 cm × 1.8 cm, thin leathery, narrowly obtuse, 3 shorter ones up to 1.5 cm long, acute, closely adpressed to the nut.

H. nervosa is locally frequent on low-lying flat land and hill slopes on clay-rich fertile soils up to 600 m altitude. The density of the wood is 605-895 kg/m³ at 15% moisture content. See also the table on wood properties.

30, 100, 102, 258, 297, 324, 358, 417, 476, 514, 601, 677, 748.

• Hopea (merawan)

• K.M. Kochummen (selection of species),
• F.T. Frietema (selection of species)