Robusta Coffee Beans
The other primary taxon of coffee, Coffea canephora var. Robusta. (The taxonomy is not clear-cut: some sources use "robusta" to refer to any variety of C. canephora , and some use "robusta" as a species name.) As indicated by the variety name, robusta trees grow taller, are more resistant to pests and disease, and produce more fruits than arabica. It is grown in Africa and Brazil, but not very much in Central America, and holds the remaining third of the world market.
The caffeine content of robusta beans is about twice that of arabica. Robusta are typically used for instant coffee and in supermarket-grade blends. Generic supermarket coffee is typically a blend of good arabica, medium quality arabica, and robusta. The instant coffee segment is comprised primarily of processed robusta and lower quality arabica.
Fair
Trade Coffee: Sustainable, Quality Coffee For the Next Generation 