Tree with stout branches, glabrous. Leaves well spaced towards the ends of the branches; Inflorescence a terminal compound umbel, almost sessile, saucer-shaped bracts caducous; Stamens 5, exserted. Ovary subcylindric, c. 1.5 mm long, 7-8-celled, disk with a pustulate central stigmatic boss.
Asia-Tropical: Maluku (Maluku present), Halmaheira: Ake Mumar to upper reaches of the Kakatua-matawe present
Malesia: Moluccas (Halmaheira: Ake Mumar to upper reaches of the Kakatua-matawe). Fr. .
This plant is evidently similar to 6. O. umbelliferum described by Rumphius. However, a number of differences make it unlikely that it is the same species. The diameter of the inflorescence of the Halmaheira plant is only about half that given by Rumphius; the lateral rays of the inflorescence are distinctly articulated near the base, a feature now shown in Rumphius' figure; and the sterile bacciform flowers are long-pedicelled, whereas Rumphius described and figured his as borne in capitula.