Dillenia borneensis Hoogl., Blumea 7 (1952)
Latin for 'from Borneo'.

Description
Upper canopy tree up to 45 m tall and 80 cm dbh. Stipules absent. Leaves alternate, simple, penni-veined, margin toothed. Flowers ca. 40 mm in diameter, yellow, placed in loose racemes. Fruits ca. 20 mm long, green-brownish, fleshy capsule.

Ecology
In undisturbed and secondary mixed dipterocarp forests up to 500 m altitude. Usually on hillsides and ridges, but also found on alluvial sites. On sandy to clayey soils.

Uses
The timber is locally used.

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

Local names in Borneo
Gerige, Rakau, Riga, Rogung, Simpoh jangkang, Simpur.