Hopea micrantha Hook.f., Trans. Lin. Soc. 23 (1860)
Latin for 'small flowered'.
Hancea micrantha Pierre
Petalandra micrantha Hassk.
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.
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]
Mostly in undisturbed keranga forests and freshwater swamps up to 500 m
altitude Usually on poor (white) sand soils.
The timber is used.
Borneo: Merawan kerangas, Selangan.