Subtropical rainforests are thought to have been widespread when the Ogasawara Islands were uninhabited. They have declined as a result of development, and now they can only be seen in humid environments in certain areas on Hahajima Island. Tall forest where the trees reach 20 m can be seen with its canopy comprised of plants like Elaeocarpus photiniaefolius as well as Planchonella obovata. Morus boninensis, which has currently become a rare species because it was used as lumber, can also be seen.