Papua New Guinea together with the West Papua region of Indonesia (New Guinea) make up a major tropical wilderness area that still contains 5% of the original and untouched tropical high-biodiversity terrestrial ecosystems. PNG in itself contains over 5% of the world's biodiversity in less than 1% of the world's total land area. The flora of New Guinea is unique because it has two sources of origin; the Gondwana flora from the south and flora with Asian origin from the west. As a result, New Guinea shares major family and genera with Australia and the East Asia, but is rich in local endemic species. The endemicity is a result of mountainous isolation, topographic and soil habitat heterogeneity, high forest disturbance rates and abundant aseasonal rainfall year round. PNG boasts some 15–21,