Gnetophytes are a unique group of seed plants that belong to the clade Gnetophyta. They are characterized by their distinct features, such as having vessels in their xylem, which is a type of tissue that transports water. This group includes three main genera: Gnetum, Ephedra, and Welwitschia. Gnetophytes are primarily found in tropical and arid regions. These plants exhibit a variety of growth forms, from climbing vines to large, desert-dwelling species. Gnetophytes are notable for their reproductive structures, which can resemble those of flowering plants, even though they are not true angiosperms. Their unique characteristics make them an important subject of study in plant evolution.