Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Acanthocalycium is a genus of cactus consisting of three species from Argentina. The taxon name comes from Greek akantha (meaning prickly) and kalyx (meaning buds), which refers to the spines on the floral tubes. These plants are globose to elongate, with numerous ribs on the spiny stems. Flowers range from white to pink to red and open during the day. 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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