Which group of plants is known to be desert dwellers?

Gnetophyta is known for having species that thrive in arid environments, making them well-suited to life in deserts. This group of plants includes genera like Ephedra, which can be found in dry, sandy habitats. Their adaptations, such as reduced leaf surface area to minimize water loss and the ability to survive in nutrient-poor soils, contribute to their success in such challenging environments.

While other groups mentioned may contain some species that can tolerate dry conditions, they are not exclusively or predominantly desert dwellers. For instance, angiosperms (flowering plants) include a wide variety of species with diverse habitats, and gymnosperms (like conifers) are typically found in a range of climatic conditions but are not specifically characterized as desert survivors. Sphenophyta, on the other hand, mainly consists of horsetails, which prefer wet, marshy areas rather than arid deserts. Thus, Gnetophyta stands out as the most characterized group among the options provided for its association with desert ecosystems.