Plants that grows on extremely dry soils are placed under

A Xerophyte is a species of plant that is adapted to survive in an environment with less water or in extremely dry soils. Example: cacti, pineapple.
A Hydrophyte is a plant species that live in water and adapt to its environment. Example: Valisineria, Hydrilla.
Thallophyta is a polyphyletic group of non-mobile organisms that are grouped based on the same characteristics. Example: Spirogyra, Ulothrix.
Hydroponics is the method of growing plants without soil.