Dipterocarpus caudiferus Merr., Philip. J. Sc. 29 (1926)
Species name meaning 'with tail'.
Dipterocarpus kutaianus Sloot.
Dipterocarpus macrorrhinus Sloot.
Emergent tree up to 63 m tall and 140 cm dbh. Stem with resin. Stipules ca.
70 mm long. Leaves alternate, simple, penni-veined, leaf lamina folded between
secondary veins, glabrous. Flowers ca. 36 mm in diameter, white-yellow, placed
in racemes. Fruits ca. 20 mm long, green-red, with two 140 mm long wings on top
of the nut, wind dispersed.
Twig, leaf beneath and margin, petiole, raceme and young leaf bud sparsely, 2-2.5 mm long, +/- fugaceous
or caducous silky long tomentose; subpersistent on young trees, occasionally persistent on bud, twig, and
petiole. Twig c. 5 mm diameter, rather stout, terete; frequently rather verrucose and sometimes
(usually in young trees) papery. Bud 10-25 by 3-5 mm. lanceolate, somewhat compressed. Stipules c. 1 cm
long, linear. Leaves 11-20 by 5-15 cm. elliptic, thinly coriaceous, base obtuse or cuneate. apex
prominently to 8 mm long acuminate; margin frequently sinuate towards the apex; midrib beneath often
slightly verrucose; nerves 12-20 pairs, dense, straight, at c. 40-50 ; tertiary nerves densely
scalariform, slender; petiole 3-4 cm long, rather long and slender, persistently
hispid on the knee. Raceme to 15 cm long, terminal or axillary, terete, becoming angular on
drying, simple or singly branched; bracteoles to 30 by 2.5 mm, linear, glabrous, caducous. Flowers
distichous; buds to 5 by 0.8 cm. Calyx and corolla typical, calyx glabrous. Stamens 25, shorter than
the style; filaments short; anthers narrowly oblong, tapering apically; appendage to connective tapering,
glabrous, slightly shorter than the anther. Ovary ovoid-conical, glabrescent; stylopodium twice as long
as ovary, narrowly cylindrical, densely tomentose; style half as long as stylopodium, narrowly
cylindrical, glabrous. Fruit calyx entirely glabrous; tube to 3.5 cm diameter and long, obturbinate,
tapering abruptly at the base and gradually to the 0.8-1.3 cm neck; 3 longer lobes 12-17 by 2-3 cm, oblong-
lanceolate, obtuse, tapering to c. 5 mm broad at the base, prominently 3-nerved; shorter lobes 4-6 by
5-7 mm, deltoid, obtuse, undulate. [from Flora Malesiana]
Clay soils in Mixed Dipterocarp forests, on undulating land and hillsides below 800 m; sometimes
semigregarious on fertile soils.
Timber is harvested commercially.
Borneo: Andri, Bajan, Damar laut, Keruing, Keruing bukit, Keruing puteh, Santiulit,