Flora Diversity Indonesia is integrated in phytogeogaphical region of Malesiana. Malesiana consists of Malaysia, Sumatra Java, Small Sunda Islands, Kalimantan, Philippine, Sulawesi, Maluku, Papua, Papua New Guinea and Solomon Islands. The plants composition in west Indonesian forests are similar to those in Vietnam, Malaysia, Philippine, India and Thailand, which are part of the Indo-Malaysia region. Whereas, the east Indonesian forests are similar to Australia.
The tropical rain forests of Malesiana are mostly dominated by Dipterocarpaceae spesies, such as camphor, keruing and shorea. Sumatra and Kalimantan are dominated by heterogenic tropical rain forests with high moisture and rainfall, whereas the seashores are full of mangrove vegetation. Forest types in Java and Bali are more diversethan in Sumatra and Kalimantan. This is caused by the more various moisture and rainfall. Moving to the east, the rainfall and moisture tend to lessen. As a consequence, tropical rain forests, tropical monsoon forests, tropical savanna forests and mangrove are found in Java and Bali.
The middle areas of Indonesia, including Sulawesi, Nusa Tenggara and Maluku has lower moisture and rainfall than other Indonesian regions. Vegetation types in those areas include tropical savanna, mountain forests and mixture forests. Papua (east Indonesian region) is usually composed of tropical rain forest similar to that found in North Australia which, is dominated by Eucalyptus sp.
A little review of the biodiversity in Indonesia.