Dipterocarpus gracilis Bl., Bijdr. (1825)
Latin for 'narrow or thin'.

Synonyms
Anisoptera palembanica Miq., Dipterocarpus angustialatus Heim, Dipterocarpus bancanus Burck, Dipterocarpus fulvus Bl., Dipterocarpus hispidus (non Thw.) F.-Vill., Dipterocarpus marginatus Korth., Dipterocarpus pilosus Roxb., Dipterocarpus schmidtii Heim, Dipterocarpus skinneri King, Dipterocarpus vanderhoevenii K. & V., Dipterocarpus velutina Vidal, Dipterocarpus vernicifluus Blanco, Mocanera verniciflua Blanco, Shorea mollis Boerl.

Description
Upper canopy tree up to 50 m tall and 100 cm dbh. Stem with resin. Stipules ca. 50 mm long. Leaves alternate, simple, penni-veined, lower surface and petiole covered with short soft hairs, lamina only slightly folded between secondary veins. Flowers ca. 45 mm in diameter, whitish-yellow?, placed in racemes. Fruits ca. 20 mm long, red-green?, with two ca. 140 mm long wings placed on top of the nut, wind dispersed.

Ecology
In undisturbed mixed dipterocarp forests up to 1200 m altitude. Can be found throughout the forest, from alluvial sites to dry hillsides and ridges. Also found on limestone. In secondary forests usually present as a pre-disturbance remnant tree.

Uses
The timber is commercially harvested.

Distribution
Andaman Islands, Birma, Thailand, Peninsular Malaysia, Sumatra, Java, Borneo (Sarawak, Brunei, Sabah, West- and East-Kalimantan), Philippines.

Local names in Borneo
Damar kumbang, Kaladan, Keruing, Keruing kesat, Keruwing daun kecil, Kruwing, Pudan, Tempurau.