The little light bulb just went off over my head--- Roots are functional, carrot, salsify. Tubers just sit there being storage, and therefore have a natural insecticide/fungicide built in. ?? So a tuber should be cooked...?
A root such as our carrots are very domesticated to be big enough to eat. Is there wild salsify, beet, rutabaga?
Yams, sweet potatoes, are tubers? The photo is of a tuber, root?? It was in the grocery, trying to sprout. I thimmk Taro.