This communication deals with the observations of medicinally important weeds of Brahmaputra valley of Assam. About 74 species belonging to 64 genera of 36 families were recorded medicinal. The medicinal importance of these plants are enumerated in this paper.

A field observation was conducted in clay soil of Rewa division (M.P.) during rainy season of 1999-2000. The weeds are a serious problem in agriculture. The weed crop competition has been a limiting factor in the growth and yield of soybean and the amount of potential loss occurring on account of weed is virtually unknown. In this paper the author presents the 22 medicinally important weed species of soybean with details of family, vernacular name and medicinal utility.