Dipterocarpus kunstleri King

Twig, lamina and petiole glabrous; leaf nervation puberulent or glabrous beneath; leaf bud and stipule outside persistently densely minutely pale grey adpressed puberulent, appearing grey lepidote. Twig to 5 mm ø apically, terete or slightly ribbed and compressed; stipule scars prominent. Bud 12-15 by 2-3.5 mm, narrowly falcate, acute. Stipule to 7 by 0.8 cm, linear. Leaves 13-22 by 7-10 cm, elliptic to broadly lanceolate, base cuneate; apex shortly acuminate (more prominently acuminate in young trees); nerves 16-18 pairs, prominent beneath, at c. 40° to 50°; petiole 2-3 cm long. Raceme to 22 cm long, terminal or axillary, slender, glabrous, somewhat compressed, singly branched. Flower bud to 3.5 by 1.5 cm. Calyx and corolla typical, calyx glabrous. Stamens c. 30, somewhat longer than the style; filaments short, anthers linear, tapering; appendage to connective as long as anther, slender. Ovary ovoid-conical, shortly densely pubescent; stylopodium and style about 5 times as long as the ovary, tapering from the base, shortly tomentose but for apical 1/4. Fruit calyx glabrous; tube to 5 by 2.5 cm, ellipsoid, tapering gradually to the base and to the strongly constricted c. 1 cm ø neck; 5-ribbed or almost winged, the ribs c. 1 mm thick and 4 mm broad apically, either confined to the apical half or continuing to the base as shallow rounded ridges, terminating ± abruptly distally as obtuse tubercles; 2 longer lobes to 11 by 1.5 cm, of very variable length, sometimes no longer than shorter lobes, lanceolate, coriaceous, obtuse, tapering abruptly to the c. 5 mm broad base, 3-nerved, nerves indistinct; shorter lobes to 6 by 5 mm, small, recurved, somewhat thickened.

An upper canopy tree of undisturbed mixed dipterocarp forest at elevations up to 100 metres. Often on alluvial sites, also on hillsides and ridges with sandy to clayey soils. In secondary forests usually present as a pre-disturbance remnant tree

Can be grown by seedlings.