Dipterocarpus tempehes Sloot., Reinwardtia 5 (1961)

Diagnostics
Upper canopy tree up to 50 m tall and 116 cm dbh. Stem with resin. Stipules up to ca. 80 mm long. Leaves alternate, simple, penni-veined, glabrous, lamina folded between secondary veins. Flowers ca. 54 mm in diameter, white-pinkish, placed in racemes. Fruits ca. 35 mm long, green-yellow, wingless.

Description
Twigs, leaf bud, stipule outside, and petiole very shortly densely evenly buff pubescent, leaf nervation beneath and stipule within sparsely so; nervation above caducously so. Twigs to 2 by 4 mm towards the compressed apices, much branched, slender, becoming terete; stipule scars slender, dark. Bud to 12 by 3 mm, slender, lanceolate, acute. Stipule to 8 by 1.2 cm, lorate, acute. Leaves 6-12 by 3.5-8 cm, broadly elliptic to obovate, thickly coriaceous, with broadly cuneate base and acute to shortly abruptly acuminate apex; prominently persistently folded between the 9-12 pairs of sharply ascending nerves; nerves at 35-40 degrees; tertiary nerves very slender, densely scalariform; petiole 1-2 cm long, short, drying densely buff pubescent. Raceme to 2.5 cm long, very short, axillary, terete, densely shortly evenly buff pubescent, unbranched, bearing to 3 distichous flowers. Flower bud to 3 by 0.8 mm. Calyx and corolla typical, calyx glabrous. Stamens c. 30, somewhat shorter than anther; anther narrowly oblong, tapering into the acicular appendage; appendage as long as anther, prominent. Ovary ovoid, pubescent; style filiform, pubescent except in the apical 1/3. Fruit pedicel vestigial. Calyx glabrous; tube to 4 by 4 cm, turbinate, with prominent but unraised pale lenticels; calyx lobes vestigial. [from Flora Malesiana]

Ecology
In undisturbed mixed dipterocarp forests up to 400 m altitude. Mostly on alluvial sites and along rivers, rarely on hillsides. On clayey to sandy soils.

Uses
Timber is commercially harvested.

Distribution
Borneo.

Local names
Borneo: Bajan, Bajan uhit, Becupu, Karup, Keruing, Keruing asam, Keruing bukit, Keruing salatus, Keruing tapayan, Ran, Senara, Sendara, Tempehes.