Cotylelobium lanceolatum Craib, Kew Bull. (1913)

Latin for 'lance-shaped'.

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

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.

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.

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

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