Lycopsida, also known as Lycopodiopsida, refers to a class of primitive vascular plants that are characterized by their small, needle-like leaves and creeping stems. Some synonyms used interchangeably with Lycopsida include lycopod, clubmoss, ground pine, and creeping cedar. These plants were once dominant in ancient forests during the Carboniferous period and have been used for medicinal and decorative purposes for centuries. They can be found in various regions around the world, particularly in damp and shaded areas. Today, they serve as an essential link between the ancient and modern botanical worlds, and they continue to fascinate researchers and enthusiasts alike.