Transpiration is the inevitable loss of water vapours from plant leaves/stems as a result of gas exchange. This process happens when water moves from the roots of a plant, travelling up through the stem, then evaporating from the surface of the leaves, from specialized tissue called stomata.
In super dry places, plants face the issue of losing too much water to transpiration. Temperature is a factor that increases the rate of transpiration in many plants. In areas of high temperature, the transpiration rate can become too great, leading to plant dehydration. To combat this, plants have developed some adaptations: reduced leaf surfaces to minimize water loss, open and close stomata depending on times of lowest temperature, or some even have specialized tissues that hold water to be used later. The plants that usually have these adaptations are xerophytes.