Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Coryphantha (from Greek, "flowering on the top") or Beehive cactus is a genus of small to middle-sized, globous to short-columnar cacti. The genus is found from Mexico to southern New Mexico and Texas in the United States. With its two subgenera, forty-three species and eleven subspecies, this is one of the largest genus of cactus. There are four characteristics that distinguish Coryphantha from other cacti. (1) Their bodies do not have ribs, just tubercles. (2) The flowers form at the top of the plant (the apex or growing end of the stem). (3) the tip (podarium) of each flowering tubercle has three parts, the spiney areole, the groove and the axil. Without the groove its is not a Coryphantha. (4) The seed coat (or testa) has a net-like pattern (reticulate). More than many other cacti, the Coryphantha change in their appearance over their lifespan. The presence or absence of a central spine is not indicative of the genus, even in fully adult plants.

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