Euonymus castaneifolius Ridl., Kew Bull. (1931)

Latin for 'leaves like Castanea'.

Euonymus moultoni Ridl.

Sub-canopy tree up to 30 m tall and 26 cm dbh. Stipules dropping early. Leaves oppposite, simple, penni-veined, leathery, often with black dots, margin usually slightly toothed. Flowers ca. 3.7 mm in diameter, white-yellow, placed in cymes. Fruits ca. 13 mm long, red, dehiscent capsule, seeds black with yellow-orange aril.

In undisturbed forests up to 1800 m altitude. Usually in mixed dipterocarp forests, but also present in keranga forest. Mostly on hillsides and ridges with sandy to clayey soils. In secondary forests usually present as a pre-disturbance remnant tree.

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

Local names
Borneo: Chemaliang, Perupak, Sait, Tulang ular.