Manas Biosphere Reserve (MBR) which is declared by UNESCO in 1989 an area of 2837 Sq. Km. from the district Kokrajhar to Udalguri district of Assam. The whole area covered the BTAD part of Assam with a number of reserve forest.. Baksa is a district of BTAD (Bodoland Territorial Autonomous districts) located in north-western part of Assam. In fact, the district is a curve out of parts of Nalbari, Barpeta, Kamrup and small portion of Darrang district. Total geographic area of the district is 2535.44 sq. km. Topography the district is covered by plain and foothills areas. The district is covered by international boundary of Bhutan in the northern and Barpeta, Nalbari and Kamrup district in the southern part. The east and western boundaries of the district respectively shares with the the district of Udalguri and Chirang. The elevation ranges between 60 meter on south and 720 meter along the Bhutan hills of the north. Climate is warm and humid with 300-400 cm rainfall average annual rainfall. Temperature ranging between 360 C in summer and 60 C in winter with 80% of relative humidity. Natural vegetation include mainly four types viz. evergreen and semi-evergreen, deciduous, climbers, herbs, shrubs and grass. Tribal people are the main habitant in the study area and they used the forest product for their livelihood, economic and medicinal purpose. This study focus on some selected tree species and their seasonal variation with the help of phonological data which have medicinal and economic importance in our life.
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