Ryparosa kostermansii Sleum., Blumea 7 (1954)

Named after A.J.G.H. Kostermans [1907-?], a Dutch botanist.

Mid-canopy tree up to 31 m tall and 36 cm dbh. Stipules dropped early. Leaves alternate, simple, tripli-veined, glabrous, whitish below. Flowers ca. 3 mm diameter, green-white-yellow, placed in racemes. Fruits ca. 19 mm diameter, green-yellow, berries with whitish pulp.

In undisturbed mixed dipterocarp forests up to 800 m altitude. Usually on hillsides and ridges with clay to sandy soils. In secondary forests usually present as a pre-disturbance remnant tree.

The fruit is edible.

Borneo (throughout the island).

Local names
Indonesia: Berukun, Betikel, Dayu, Kakapasan, Lembuan.