There are about 285 species of cactus. These plants have many traits that help them live in hot, dry places. Instead of leaves, they have spines that give shade and protection. Fairy Castle Cactus is a small form of the Triangle Cactus. It gets its name from its castle-like shape. Larger varieties of Triangle Cactus can grow up to 23 feet tall.
- "Acanthocereus tetragonus". Encyclopedia of Life, available from: http://eol.org/pages/596860/details
- “Acanthocereus tetragonus.” Wikipedia, The Free Encyclopedia. Available from:
- “Cactus.” Wikipedia, The Free Encyclopedia. Available from: http://en.wikipedia.org/wiki/Cactus
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