Geum rivale, the water avens, is a flowering plant of the family Rosaceae. Other names for the plant are nodding avens, drooping avens, cure-all, water flower and indian chocolate. It is native to much of Europe, with the exception of Mediterranean areas, as well as some parts of Central Asia and North America. In North America, it is known as purple avens. It grows in bogs and damp meadows, and produces nodding red flowers from May to September.