Wiebel, Candollea 30 (1975)
Named after A.J.G.H. Kostermans [1907-?], a Dutch botanist at Bogor
Botanical Gardens, Indonesia.
Mid-canopy tree up to 31 m tall and 75 cm dbh. Stipules dropped early.
Leaves alternate, simple, penni-veined, glabrous, very short petioled,
conspicuously obovate. Flowers ca. 10 mm in diameter, white-yellow, fimbriate
petal margins, placed in racemes. Fruits ca. 24 mm long, green, fleshy drupe.
In undisturbed mixed dipterocarp forests up to 700 m altitude. Common along
rivers, hillsides and ridges on sandy soils, but also limestone. In secondary
forests usually present as a pre-disturbance remnant tree.
Borneo (Sarawak, Sabah, Central- and East-Kalimantan).