Equisetaceae is a family of plants commonly known as horsetails. These ancient plants are characterized by their jointed stems and whorled leaves, which give them a unique appearance. They thrive in wet environments and can often be found in marshes, along riverbanks, and in disturbed areas. Horsetails reproduce using spores rather than seeds, and they have a long evolutionary history, dating back to the time of the dinosaurs. The most well-known genus within this family is Equisetum, which includes several species that vary in size and habitat preferences.