One of the most confusing parts of nutrition is dealing with fruits and vegetables that go by multiple names. In the case of this ingredient, the USDA labeled it black cabbage in their 2010 report, which made little sense since it's more likely your grandma called it that, not your generation.
Are lacinato kale, dinosaur kale, tuscan kale, black kale, and black cabbage all the same thing? Yep. Probably the first 3 are the most used terms today, with the last 2 being typically used by older Americans. Whatever you want to call it, the amount of antioxidants it has is similar to the softer curly green kale.
USDA Database for the Oxygen Radical Absorbance Capacity (ORAC) of Selected Foods, Release 2 - Prepared by Nutrient Data Laboratory, Beltsville Human Nutrition Research Center (BHNRC), Agricultural Research Service (ARS), U.S. Department of Agriculture (USDA) - May 2010