The Sonitpur district is situated along the north bank of river Brahmaputra between 260 30’N to 270 02’N Latitudes and 920 17’E to 930 47’E Longitudes covering an area of 5255.2 km2 (492145 ha) that accounts for 6.27% of the geographical area of the state. The district is largest district of the state in terms of percentage coverage of wetland areas. This study is conducted to assess the phytosociological status of aquatic macrophytes of Bosasimalu, Borsola, Borakota, Bhedelimora and Gereki wetland of the district during the period of April 2012 to April 2013. All total 228 plant species in different categories under 57 families were recorded and out of which moist soil, ecotone and rooted emergent hydrophytes have found to be dominating macrophytes in the present study. Among the life forms, chamaephytes found to be highest life form followed by hydrophytes and geophytes. The plant species like Alocasia cucullata Schott., Colocasia esculanta (L.), Schott. Eichhornia crassipes Solms-Laub., Hydrilla verticillata (l.F.) Royle., Hymenachne assamica Hitch., Ipomea carnea Jacq. ,Nymphaea nouchali Burn.fsyn.etc have shown predominant during summer and Alocasia indica Schott., Eichhornia crassipes Solms-Laub., Ipomea carnea Jacq., Nymphaea nouchali Burn.fsyn., Saccharum spontaneum L., Sagittaria sagitifolia L. etc have found to be dominating plant species during winter.
