|Ricinis communis L.|This fast-growing tree can reach heights of 10 m. It forms somewhat ephemeral thickets which can shade out other species. Although rodents and granivorous birds may disperse some seeds, man is the principal agent. Castorbean is destroyed by fire; it has not been evaluated for biological control. It grows in dry and mesic habitats from sea level to 1,200 m on all major islands.