The camel can draw on the reserves in the hump while the cactus relies on the moisture in the fleshy stem during periods of drought. The green in the stems has taken the place of leaves in the photosynthesis process. Leaves are very small or non existent. The needles or spines can act as protection against marauders. These needles also slant in a way to catch moisture and direct it toward the stem where it can be absorbed by the plant.
Some plants have waxy surfaces to cut down on evaporation.
To many people the symbol of the desert is the Saguaro cactus. This cactus is truly a majestic plant. It can be up to fifty feet tall and weigh twelve tons. The Saguaro has a huge capacity for storing water and is known to flower and fruit even during long periods of drought. The blossoms and fruit feed countless insects and animals, even the Papago and Pima Indians.