Youngberry (Rubus ursinus cv. Young)'s a hybrid between a blackberry and a dewberry, both members of the genus rubus of the rose family, first cultivated in the western United States. Byrnes M. Young, a businessman in Morgan City, Louisiana, who loved science and plants had an ongoing correspondence with Luther Burbank. While he'd no success growing either loganberries or Phenomenal berries, he crossed the Phenomenal berry with the better-adapted Austin-Mayes dewberry to produce ‘Youngberr… (More on Youngberry)