Inland, from the tidal zone to the top of the mountains there is a varied range of vegetation, cloud forest, upland, palm, plantation, areas dominated by climbers of the genus Merremia, savannas, native secondary forest, fragments of introduced trees, cultivated areas, freshwater swamps, swamps of the palm ''Nypa fruticans'', atoll forests, forests in rocky areas and beaches. There are about 1230 species of ferns and flowering plants, of which 782 are native, including 145 native fern species. On Pohnpei Island, there are about 750 plant species, of which 110 are endemic. Another 457 species have been introduced.