Amarillo is a relatively new American hop variety that has been described as "super cascade." The bitterness is between 5 & 11% AAU, making Amarillo a good hop for flavor & aroma additions. The flavor profile is very citrusy, especially leaning toward a distinct orange flavor & aroma. I also find Amarillo to be somewhat sweet until it mellows out in a beer. This hop was reportedly discovered & introduced by Virgil Gamache Farms Inc. & resulted as a mutation of another hop variety.