Distribution of flora in Indonesia was formed because of the geological events that occurred in millions of years ago, namely during the melting of ice (glacial period). At the time of ice melting occurred on a large scale causing rising sea levels in the earth, this causes some shallow areas that later became submerged by sea water and form a new waters.
Some new waters around Indonesia, which was formed during the glacial period was the termination of the Java Sea shoal located in the Sunda region and Arafuru Sea shoal areas contained in Sahul. Formation of new waters in these shallow areas that originally caused the flora can freely migrate eventually hampered by changes in geological conditions.
Plant species spread all over Indonesia such as tropical forests, seasonal forests, montane forests, mangrove forests and tropical savanna. Distribution of flora in the territory of Indonesia itself was divided into four major groups of Indonesian flora region,
1. Flora region of Sumatra, Kalimantan
Scattered on the island of Sumatra and Kalimantan as well as small islands around it (Nias, Enggano, Bangka, Belitung, Kep. Riau, Natuna, Batam, Buton, etc.). Examples of typical flora that grows is the Wreck of Interest (RAFLESIA Arnoldi)
2. Flora of Java-Bali region
Scattered on the island of Java, Madura, Bali and the surrounding small islands (Thousand Islands, Kep. Karimunjawa). Flora typical example is a tree that grows Burohal (Kepel)
3. Flora Wallacea Region Islands
Scattered on the island of Sulawesi, Timor, Maluku and Nusa Tenggara Islands. Examples are tree flora tumuh Sago
4. Flora of Papua region
Papua New Guinea and covers an area of small islands in the vicinity. Typical examples of growth is Uacalyptus Flora, the same plant species growing in the region of North Queensland in Australia.
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