Others have special features about their shape or structure (xeromorphs). Thick waxy cuticle ("Aloe"); hairy surfaces ("Edelweiss"); dense packing of leaves, reduced leaf size (species of cypress); reduced density of stomata (many cacti); pitted and grooved position of stomata (Ammophila) Water storage in stem and tubers, etc. (baobab). They may also protect this water store from animals by spines and chemicals.