Vegetation that grow in the Sahara must be able to adapt to unreliable precipitation and excessive heat. To survive they have made modification leaves into spines to prevent excessive loss of water from the plant body and deep roots to get to water source.
It is really hot in there. I wonder how plants survive?
The leaves and stems of many desert plants have a thick, waxy covering. This waxy substance does not cover the stomata, but it covers most of the leaves, keeping the plants cooler and reducing evaporative loss.