High Quality Content by WIKIPEDIA articles! The Philippines supports a rich and varied flora with close botanical connections to Indonesia and mainland Southeast Asia. Forests cover almost one-half of the land area and are typically tropical, with the dominant family, Dipterocarpaceae, representing 75% of the stands. The forest also has vines, epiphytes, and climbers. Open grasslands, ranging up to 2.4 m (8 ft) in height, occupy one-fourth of the land area; they are man- made, the aftermath of the slash-and-burn agricultural system, and most contain tropical savanna grasses that are nonnutritious and difficult to eradicate. The diverse flora includes 8,000 species of flowering plants, 1,000 kinds of ferns, and 800 species of orchids.