Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Echinocactus polycephalus is a cactus that occurs in the Mojave Desert and northern Sonoran Desert. The stems are sometimes solitary, but more often in clusters of as many as 30, each up to 0.6 m tall. The spines are yellow to red. The fruits are densely woolly, giving the common name "cotton top cactus". In the past, it was also called "niggerhead cactus." A cactus (plural: cacti, cactuses or cactus) is a member of the New World plant family Cactaceae. Their distinctive appearance is a result of adaptions to conserve water in dry and/or hot environments. In most species, the stem has evolved to become photosynthetic and succulent, while the leaves have evolved into spines. Many species are used for ornamental plants, and some are also grown for fodder, forage, fruits, cochineal, and other uses.

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