Dipterocarpus confertus Sloot., Bull. Jard. Bot. Btzg. III, 8 (1927)
Species name meaning 'clustered or crowded'.
Emergent trees up to 51 m tall and 151 cm dbh. Stems with resin. Stipules
ca. 50 mm long. Leaves alternate, simple, penni-veined, peltate, surface folded
between secondary veins, densely hairy on lower surface. Flowers ca. 56 mm in
diameter, white-pinkish, placed in subcymose inflorescences. Fruits ca. 25 mm
long, red-green, with two ca. 130 mm long wings placed on top of the nut, wind
Young twig, leaf bud, stipule outside, petiole, nerves and midrib above, nervation beneath, and
inflorescence persistently 1.5-3.5 mm long pale fulvous-brown tufted hispid hairy: leaf surface
caducously so. Twig 0.8-1 cm apically, stout, uneven, cracked and marked by the thin amplexicaul
stipule scars. Bud 1.2-2 by 1-1.7 cm, broadly ovoid, obtuse or subacute. Stipule to 5 cm long
and broad, broadly ovate, obtuse, caducous. Leaves (18-)22-35 by (14-)16-22 cm,
broadly obovate to orbicular, chartaceous, concave; base obtuse or subpeltate, the lamina
continuing as a slight ridge above the base of the midrib; apex obtuse
or shortly acuminate; nerves 9-12 pairs, well spaced, at 45 to 60 ; petiole 5-6 cm long.
Inflorescence to 7 cm long, subcymose, singly branched or unbranched,
short, bearing few distichous flowers; bracts and bracteoles to 25 by 5 mm, linear, obtuse,
sparsely tomentose, caducous. Bud to 4 by 1 cm. Calyx and corolla typical, calyx shortly
tomentose. Stamens c. 25, as long as style; filaments as long as anther,
applanate at base, tapering and filiform below anther; anther narrowly oblong, stout, tapering;
appendage almost as long as anther, stout at base, tapering and filiform at apex. Ovary small,
ovoid-conical, densely pubescent; stylopodmm indistinct; style 3 times as long as ovary,
columnar, slender, tomentose except at apex. Fruit subsessile; calyx tube densely pale fulvous
long tomentose, c. 3 by 1.7 cm, narrowly obovoid, with 5 indistinct ridges when mature,
tapering basally to the pedicel, only slightly constricted apically; 2 long lobes to 14 by 3 cm,
glabrous within, sparsely tomentose outside, oblong-lanceolate, obtuse, tapering to the
constricted but non-revolute base, prominently 3-nerved; 3 shorter lobes to 1.7 by 0.7 cm,
oblong, recurved distally. [from Flora Malesiana]
In undisturbed mixed dipterocarp forests up to 800 m altitude. Mostly on
hillsides and ridges with clayey to sandy soils.
Timber is commercially harvested.
Borneo: Keruing, Keruing buluh, Keruing kobis, Keruing kolong, Keruing eloi, Keruing
mengkai, Keruing kerupuk, Tempudau.