Dipterocarpus grandiflorus (Blanco) Blanco, Fl. Filip. ed. 2 (1845)
Species name meaning 'Large flowers'.
Dipterocarpus blancoi Bl.
Dipterocarpus griffithii Miq.
Dipterocarpus motleyanus Hook.f.
Dipterocarpus pterygocalyx Scheff.
Mocanera grandiflora Blanco
Vatica trigyna Griff.
Upper canopy tree up to 49 m tall and 67 cm dbh. Stem with resin. Stipules
up to ca. 180 mm long. Leaves alternate, simple, penni-veined, glabrous, lamina
only slightly folded between secondary veins. Flowers
ca. 94 mm in diameter, yellow-pinkish, placed in unbranched inflorescences.
Fruits ca. 50 mm long, green-red, with two ca. 140 mm long wings placed on top
of the nut, wind dispersed.
Very large hardly buttressed tree. Leaf bud, outside of stipule, parts of petals exposed in
bud, ovary apex and sometimes twig densely evenly pale buff pubescent, parts otherwise
glabrous. Twigs to 12 mm diameter, stout, becoming grey-brown; internodes short, the
leaves clustered around the twig endings. Buds to 2 by 1 cm, ovoid, acute; stipule to
18 by 5 cm, oblong-lanceolate, subacute. Leaves 10-18 by 5-12 cm, ovate, coriaceous,
+/- applanate; base obtuse or subcordate; acumen to 1 cm long, short, nerves 15-17 pairs,
prominent beneath, spreading; tertiary nerves remotely scalariform, barely elevated;
petioles 3-9 cm long, very long, slender. Inflorescences to 18 cm long, very long, slender,
axillary, borne in dense groups behind the leaves, unbranched, bearing to 3 remote
distichous flowers. Flower buds to 35 by 13 mm, fusiform. Stamens 30, exceeding style at
anthesis; filaments broad, compressed, tapering, c. 0.33 the length of the relatively short
broadly linear-lanceolate tapering anthers; appendages acicular, c. 0.66 length of
anthers. Ovary tapering into the short stoutly columnar style; ovary and style puberulent
in the basal half. Fruit pedicel to 2 by 4 mm, stout. Calyx tube to 7 by 3.5 cm. ellipsoid,
with 5 pruinose, to 1.5 cm wide, prominent coriaceous wings continuous from base to
apex; 2 longer lobes to 22 by 3 cm, oblanceolate-spatulate, obtuse, tapering abruptly
to c. 1.3 cm wide at base; 3 shorter lobes to 2 by 1.5 cm, elliptic, subrevolute.
[from Flora Malesiana]
In undisturbed but also often in disturbed mixed to seasonal dipterocarp forests up to
700 m altitude. Quite often near coastal regions on hillsides and ridges with
poor sandy, or ultrabasic soils.
Timber is commercially harvested. Oil is collected from seeds.
Andaman Islands, Thailand, Peninsular Malaysia, Sumatra, Borneo, Philippines.
Borneo: Bajan, Kalohing, Kangkawang, Kawang, Keruing, Keruing belimbing, Keruing kulup,
Keruing simpore, Tempudan, Tempudan tunden.
Malaysia: Keruing belimbing, Keruing pekat, Meluit.
Philippines: Apitong (Tag.).
Sumatra: Keruing, Lagan bras.