Desert plants have thick waxy coating on leaves called cuticle, for minimum loss of water through Sweating.
They have special photosynthetic pathway (CAM) that enables minimum loss of water during daytime because stomata remain closed.
Some desert plants develop spines instead of leaves and photosynthetic function is carried out by the flattened stem.
Stomata are arranged in deep pits (sunken stomata) to minimize loss through transpiration.