According to Wikipedia (https://en.wikipedia.org/wiki/Cactus)
A cactus (pl. cacti, cactuses, or less commonly, cactus) is a member of the plant family Cactaceae, a family comprising about 127 genera with some 1750 known species of the order Caryophyllales.
The spines are highly modified leaves and come from specialized structures called areoles. The areoles or the roundish white dots at the base of the spines, are highly modified branches. Some plants have spines but only cacti have areoles.
One on the basic experiences of living in the Arizona Sonora desert is dealing with cactus is all their varied forms. Newcomers inevitably find out that the spines are sharp, very sharp.
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