There are 28 described species in the genus and a number of undescribed species, all small, resinous trees of the subtropical and tropical Pacific Ocean, characterized by huge, simple leaves and a dioecious sexual system, a unique combination in Araliaceae.
There are 28 described species in the genus and an unknown quantity of unclassified species, all small, resinous trees found in the subtropical and tropical Pacific Ocean, characterized by large, uncomplicated leaves and a separate sexual system, a rare characteristic in Araliaceae.