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There are generally two families of coffee trees:  Arabica and robusta coffees. While Arabica coffee trees may be fragile, the beans they produce are amazing, and have low caffeine levels while literally exploding wide range of flavors and tastes.  Many robustas have a "rubber" taste and seem much more astringent (harsh) than Arabica beans.  Most instant coffee and other types of prepackaged supermarket coffees represents up to 75% or more of robusta beans.