Purple sweet potato

Back in late May I bought this purple sweet potato at a farmers' market in Baltimore. It seemed to taste about the same as typical orange sweet potatoes but maybe with a smoother texture. That could be from how long I cooked it, though. I wish I'd clarified with the seller the specific name of this because there are different kinds of purple sweet potatoes and yams. I sometimes get purple potatoes, but I  don't remember eating  a purple sweet potato before this one.

Some nutritional advice has suggested trying to vary fruit and vegetable consumption by colors because of the different nutrients connected to the colors: green, red, yellow or orange, blue or purple, and white.