Shorea balangeran (Korth.) Burck, Ann. Jard. Bot. Btzg. 6 (1887)
Named after the local name for this species.Synonyms
Hopea balangeran Korth.
Parahopea balangeran Heim
Parashorea balangeran Merr.
Shorea balangeran var. angustifolia Boerl.
Diagnostics
Mid-canopy tree up to 32 m tall and 75 cm dbh. Stem with resin. Stipules up
to ca. 7 mm long. Leaves alternate, simple, penni-veined, glabrous. Flowers ca.
10 mm in diameter, yellowish, placed in panicles. Fruits ca. 6 mm long,
green-red, with three up to ca. 50 mm long wings, wind dispersed.
Description
Large buttressed tree. Twig, leaf bud. stipule,
petiole, midrib and nerves beneath, panicle and calyx
outside shortly densely persistently red-brown puberulent:
leaves beneath cream lepidote: nut apex sparsely
puberulent. Twigs c. 2 mm diameter apically, slender,
terete, smooth. Buds 5 by 3 mm, ovoid, acute; stipule
to 7 by 4 mm, ovate, acute. Leaves 7-18 by 3-8 cm,
oblong-elliptic to lanceolate, coriaceous, conspicuously
cream beneath: base broadly cuneate to
obtuse: acumen to 1.5 cm long, slender, tapering:
nerves 13-18 pairs, slender, barely elevated beneath,
evident above, at 45-55 degrees: tertiary nerves densely
scalariform, obscure: midrib slender but prominent
beneath, obscurely depressed above: petioles 2-3 cm
long, slender. Panicle to 8 cm long, slender, terminal
or axillary: doubly branched, branchlets to 3 cm long,
with to 7 secund flowers. Flower buds to 6 by 3 mm,
fusiform: 3 outer sepals narrowly lanceolate, subacute:
2 inner short, ovoid, prominently acuminate.
Stamens 15, shorter than style at anthesis: filaments
compressed at base, gradually tapering and filiform
below the broadly ovoid anthers; appendages very
slender, glabrous, twice length of anthers; ovary
ovoid, puberulent: style columnar, c. 1.5x length of
ovary, puberulent towards base, not trifid. Fruit
pedicel short, slender, 3 longer calyx lobes to 50 by 7
mm, spatulate, obtuse, c. 2 mm broad above the to 4
by 3 mm ovate saccate thickened base: 2 shorter lobes
to 15 by 2 mm, linear, similar at base. Nut to 6 by 4
mm, ovoid, apiculate. [from Flora Malesiana]
Ecology
In undisturbed keranga or (peat)-swamp forests near the coast up to 100 m
altitude. Mostly on poor sandy soils on alluvial sites or hillsides.
Uses
The timber is used.
Distribution
Sumatra, Borneo.
Local names
Borneo: Balangiran, Kahoi, Kawi, Kelandan, Kelansau, Lempung nasi, Tomi.
Sumatra: Malangsir (Bangka).
