Dipterocarpus gracilis Blume

Twig, leaf bud, stipule outside, leaf beneath, midrib above and petiole densely persistently scabrid rufous tomentose. Twig c. 3 mm ø apically, terete or slightly compressed, with minute cracks initiating from elongated lenticels. Bud 10-14 by 3-5 mm, narrowly conical, obtuse. Stipule c. 5 cm long, narrowly lanceolate. Leaves 8-15 by 4-10 cm, elliptic to ovate, base obtuse; apex shortly acuminate; nerves 12-20 pairs, usually dense, at 40°-50°; petiole 2-2.5 cm long. Raceme to 9 cm long, terminal or axillary, terete, shortly pale brown tomentose or glabrescent, singly branched. Flower bud to 25 by 8 mm. Calyx and corolla typical, calyx shortly tomentose. Stamens c. 30, exceeding the style; filaments short; anthers linear; appendage to connective c. 2 times length of anther, filiform, tapering, sparsely setose. Ovary ovoid-conical, tapering into the stylopodium; stylopodium and style slender, filiform, tomentose in the basal half. Fruit calyx glabrous; tube to 2 cm ø, smooth, globose; 2 longer lobes to 14 by 2.5 cm, narrowly spatulate, obtuse, to 1 cm broad at base; 3 shorter lobes to 2.2 by 1 cm, ovate, constricted at base, the 2 sides becoming revolute back to back.

A canopy tree of undisturbed mixed dipterocarp forests at elevations up to 1200 metres. Found in various habitats on alluvial sites; dry hillsides and ridges; limestone. In secondary forests usually present as a pre-disturbance remnant tree

Can be grown by seedlings.