Dipterocarpus crinitus Dyer, Fl. Br. Ind. 1 (1874)

Synonyms
Dipterocarpus hirsutus Vesque
Dipterocarpus tampurau (non Korth.) Burck

Diagnostics
Emergent trees up to 63 m tall and 138 cm dbh. Stem with resin. Stipules up to ca. 30 mm long. Leaves alternate, simple, penni-veined, small, with long hairs on petiole and lower surface, inconspicuous fold between secondary veins. Flowers ca. 50 mm in diameter, white-pinkish, placed in racemes. Fruits ca. 15 mm long, red-green, with two ca. 70 mm long wings placed on top of the nut, wind dispersed.

Description
Young twig, leaf bud, stipule outside and petiole persistently c. 3 mm long golden-brown tufted tomentose, shorter on nervation beneath, midrib above and margin; leaf fugaceous pubescent above. Twig c. 3 mm apically, smooth. Bud 4-6 by 1.5-2 mm, small, oblong, obtuse. Stipule c. 3 by 0.5 cm, lanceolate, obtuse. Leaves 6-9 by 3-5 cm, elliptic, chartaceous, obtuse or shortly acuminate, base obtuse, margin revolute, persistently somewhat folded between the 13-15 pairs of nerves; petiole 1.5-2.5 cm long, slender. Raceme to 12 cm long, terminal or axillary, terete, golden long tomentose, unbranched or singly branched, branchlets bearing c. 4 flowers; bracts to 30 by 8 mm, linear, acute, sparsely tomentose outside, glabrous within. Flower bud to 3.5 by 0.8 cm. Calyx and corolla typical, calyx glabrous. Stamens 15, shorter than the style; filaments short, anthers filiform, tapering; appendage as long as anther, slender, undulated towards the apex. Ovary ovoid-conical, shortly pubescent; style and stylopodium filiform, slender, 4-5 times as long as ovary, shortly pubescent but for the distal 3. Fruit subsessile. Fruit calyx glabrous, tube 1.5-1.8 by 0.6-0.8 cm, neck 0.4-0.6 cm diameter; two longer lobes to 8 by 1.5 cm. oblong, lanceolate, acute, prominently 1-nerved; 2 shorter lobes to 3 mm long, deltoid, acute. [from Flora Malesiana]

Ecology
Widespread on undulating land and low hills, rarely to 850 m, on leached clay-rich soils in Mixed Dipterocarp forest.

Uses
The timber is commercially harvested.

Distribution
Peninsular Thailand, Peninsular Malaysia, Sumatra, Borneo.

Local names
Borneo: Bajan uhit, Bian, Kempelas, Keruing buluh, Keruing empelas, Keruwing, Kruing.
Malaysia: Keruing bulu, Keruing gombang, Keruing pekat, Keruing merakluang, Keruing chaier, Keruing (m)empelas, Resak empalas, Tampurau.
Sumatra: Ariung, Simarhalung.