Omphalea malayana is a species of flowering plant in the family Euphorbiaceae, native to Peninsular Malaysia (Pulao Tioman), Borneo (Sarawak) and the Philippines (Luzon).

[1] It was first described by Elmer Drew Merrill in 1916.

[2] Trigonostemon arboreus was assessed as "vulnerable" in the 1998 IUCN Red List, where it is said to be native only to Peninsular Malaysia.

[3] As of February 2023[update], T. arboreus was regarded as a synonym of Omphalea malayana, which has a wider distribution.

This Euphorbiaceae-related article is a stub.