The isolated higher and cooler forests of the island are home to a rich and distinctive set of plants of both Asian and Australian origin. There are especially large numbers of Nepenthes pitcher plants (>15 species), rhododendrons, and orchids. This ecoregion also contains important areas of forest on limestone upland, especially Mount Api which has clear altitudinal zones of differing vegetation. Long Pasia in the Meligan Range and the Usun Apau plateau have important areas of high-altitude wetland.