All about cactus plants. There are over 2,000 species of cacti, with various shapes and forms. Caldera cacti in southwestern US can overcome 20 m (66 ft) on height, while Rebutia cacti from Bolivia and Argentina are just several centimeters tall. Some cacti look like chandeliers or columns, others are flattened or oval, looking like ears (Opuntia). There are cacti looking like curled snakes. Some look like a barrel or a small boar, perfectly rounded. Other cacti look like starfish or wrinkled human faces covered by a white spiny raveled wool pile. The cactus stems are thickened, storing water, and the leaves are transformed into spines.
