Leaves are complex plant organs upon which the entire organism’s life depends. From their highly efficient solar energy conversion to their aid in the transportation of absorbed water, leaves are vital to plant life. Therefore, some leaves evolve and adapt different features over time to facilitate their processes. One such modification is that of storage leaves. Found on succulent plants, these leaves retain and store water. Thin-walled, non-photosynthetic parenchyma cells just beneath the epidermis serve as water storage. The fleshy leaves pictured above allows this plant to grow in very arid conditions, as its leaves can hold water for extensive periods of time.