There are an estimated 8,500 species of vascular plants in Peninsular Malaysia, with another 15,000 in the East. The forests of East Malaysia are estimated to be the habitat of around 2,000 tree species, and are one of the most biodiverse areas in the world, with 240 different species of trees every hectare. Further inland, heath forests are present. These forests host many members of the genus "Rafflesia", the largest flowers in the world, with a maximum diameter of . They also contain large numbers of carnivorous plants, such as pitcher plants, bladderworts, sundews, and ant-house plants.