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Stretching over the hilly regions of Sikkim, West Bengal and Arunachal Pradesh, this is an undulating and mountainous region, recording over 200 cm of average annual rainfall. This region has over 4000 species of plants which vary from tropical to temperate and Alpine. The main trees of this floristic region are sal, oak, chestnut, magnolia, pyrus, bamboo, silver fir, pine, birch, rhododendrons, and alpine grasses.