Robusta usually refers to Coffea Robusta, responsible for roughly 25% of the world’s commercial coffee. Taxonomy of Robusta is debated: some sources use “ Robusta” to refer to any variety of Coffea Canephora, and some use “Robusta” as a species name. Caffeine content of Robusta beans is about twice that of Arabica. Robusta can be used in espresso blending to increase body and crema content. ROUND Usually referring to mouth feel, a sense of completeness and fullness.