Hopea micrantha Hook.f., Trans. Lin. Soc. 23 (1860)

Synonyms
Hancea micrantha Pierre
Petalandra micrantha Hassk.

Diagnostica
Upper canopy tree up to 48 m tall and 90 cm dbh. Stem with resin. Stipules up to ca. 2 mm long. Leaves alternate, simple, penni-veined, with inconspicuous secondary veins placed close together. Flowers ca. 3 mm in diameter, white-yellow, placed in small panicles. Fruits ca. 10 mm long, red-green, with two ca. 50 mm long wings.

Description
Small to medium-sized smooth barked tree with small narrow buttresses and abundant stilt roots. Young twig, leaf bud, panicle, petiole, and stipule pale brown fugaceous pubescent. Twig to 1.5 mm apically, slender, glabrous apart from the apices, terete, smooth. Bud to 2 by 1.5 mm, ovoid, obtuse. Stipule to 2 mm long, narrowly deltoid, acute, fugaceous. Leaves 6-8 by 2.5-3 cm, oblong-lanceolate, coriaceous; base obtuse or broadly cuneate. equal; acumen to 1.5 cm long, caudate; nerves 10-12 pairs, indistinct, curved, with short secondaries; midrib straight, slightly raised above, prominently so beneath; petiole 7-10 mm long, short. Panicle to 1 cm long, terminal or axillary, terete; singly branched, branchlets short, bearing up to 5 +/- secund flowers; bracteoles small, narrowly deltoid, glabrescent, fugaceous. Bud small, ovoid. Calyx puberulent outside, glabrous within; 2 outer lobes narrowly ovate, acuminate, 3 inner lobes thin, suborbicular, mucronate; petals linear, densely pubescent on parts exposed in bud. Stamens 15, of 3 lengths; filaments slender, tapering; anthers broadly oblong; appendage to connective c. 1.5 times length of anther. Ovary ovoid, glabrous, without distinct stylopodium; style c. 1.5 times length of ovary, filiform, glabrous. Fruit calyx glabrous; 2 longer lobes to 5 by 1.2 cm, spatulate, obtuse, to 2 mm wide above the to 4 by 3 mm saccate deltoid thickened base; 3 shorter lobes to 5 by 5 mm, broadly ovate to suborbicular, subacute to obtuse, thin, saccate, shorter than the nut. Nut to 10 by 6 mm, ovoid; style remnant to 1.5 mm long, filiform. [from Flora Malesiana]

Ecology
Mostly in undisturbed keranga forests and freshwater swamps up to 500 m altitude Usually on poor (white) sand soils.

Uses
The timber is used.

Distribution
Borneo.

Local names
Borneo: Merawan kerangas, Selangan.