Eriophorum is a genus of flowering plants commonly known as cotton grasses. These plants are typically found in wetland habitats, such as bogs and marshes, and are characterized by their tufted, fluffy flower heads that resemble cotton. The fluffy structures are actually clusters of seeds that help with wind dispersal. Cotton grasses play an important role in their ecosystems by providing habitat and food for various wildlife. They are also significant in peatland environments, where they contribute to the formation of peat and help maintain water levels. Their presence can indicate the health of wetland ecosystems.