Hopea coriacea (PROSEA)

Plant Resources of South-East Asia
Introduction

Protologue: Ann. Jard. Bot. Buitenzorg 6: 237 (1887).

Synonyms

Peninsular Malaysia (eastern coast), Borneo (West Kalimantan, Sarawak, Brunei).

The timber is used as giam; it is locally in great demand for house supports and boat hulls.

A medium-sized to large tree of up to 45 m tall, bole tapering in lower half, cylindrical, straight, with a diameter of up to 160 cm and prominent, thin, flying buttresses, bark surface flaky or fissured, outer bark hard, chocolate-brown outside, pale fawn within, inner bark rust-brown, sapwood rich orange-brown, heartwood rust-brown; all parts except petals glabrous.
Leaves broadly ovate, 11-16 cm × 6-10 cm, thick leathery, base obtuse, acumen narrow, up to 1.2 cm long, margin slightly revolute, venation dryobalanoid, midrib slightly raised above, secondary veins 8-11 pairs, arched at 60-70°, relatively prominent, tertiary veins rather distinct, densely scalariform.
Stamens 15, in 3 whorls, ovary ovoid, glabrous at base, tapering gradually into the long and filiform style, stylopodium indistinct.
2 longer fruit calyx lobes up to 7 cm × 1.5 cm, spatulate, auriculate and shallowly saccate at base, 3 shorter ones up to 2 cm × 1.2 cm, acute, similar at base.

H. coriacea occurs scattered on well-drained yellow sandy clay soils, on ridges and hill-sides, up to 200 m altitude.

30, 258, 677, 748.