Gonystylus forbesii Gilg, in Engl. & Pr., Nat. Pfl. Fam. Nachtr. 1 (1897)

Named after H.O. Forbes [1851-1932], a Scotish botanist.

Gonystylus warburgianus Gilg ex Domke

Upper canopy tree up to 50 m tall and 73 cm dbh. Stipules absent. Leaves alternate, simple, penni-veined but venation inconspicuous, usually glabrous. Flowers ca. 5 mm diameter, green-yellow, placed in panicles. Fruits ca. 33 mm diameter, yellow-orange-brown, dehiscent capsule. Seeds with aril.

In undisturbed mixed dipterocarp, keranga and sub-montane forests up to 1800 m altitude. On hillsides and ridges with sandy soils. In secondary forests usually present as a pre-disturbance remnant.

The timber is used.

Sumatra, Borneo (Sarawak, Brunei, Sabah, West-, Central- and East-Kalimantan).

Local names
Borneo: Bakubal, Bankirai warek, Bermiang, Bidaru, Dedarah putih, Kayu malam, Koop, Merang, Paoh balang, Ramin, Serhaja, Serkaja.