There are over 120 species of "Coffea", which is grown from seed. The two most popular are "Coffea arabica" (commonly known simply as "Arabica"), which accounts for 60–80% of the world's coffee production, and "Coffea canephora" (known as "Robusta"), which accounts for about 20–40%. " C. arabica" is preferred for its sweeter taste, while "C. canephora" has a higher caffeine content. "C. arabica" has its origins in the highlands of Ethiopia and the Boma Plateau of Sudan, and was the result of a hybrid between "C. canephora" and "C. eugenioides".