Cotylelobium lanceolatum Craib, Kew Bull. (1913)

Latin for 'lance-shaped'.

Synonyms
Cotylelobium flavum (non Pierre) Ridl.
Cotylelobium malayanum Sloot.
Sunaptea lanceolata (Craib) Kosterm.

Description
Trees. Stems with resin. Twigs smooth to slightly scaly. Stipules ca. 3 mm long. Leaves alternate, simple, penni-veined, venation very fine, inconspicuous. Flowers ca. 12 mm in diameter, cream, placed in panicles. Fruits ca. 8 mm long, red, 2-winged nut, wings ca. 30 mm long, wind dispersed.

Ecology
In undisturbed mixed dipterocarp and keranga forests with poor soils. On ridges and hillsides on dry, rocky to sandy soils, also common on limestone. In secondary forests usually present as a pre-disturbance remnant tree.

Distribution
Thailand, Peninsular Malaysia, Borneo (Sarawak, Brunei, Sabah, West-, South- and East-Kalimantan).

Local names
Borneo: Bidayuh, Dangar, Resak, Resak kelabu.