Roots & Tubers
The tropical American vine, sweet potato (Ipomoea batatas) is in the botanical family Convolvulaceae. Despite its name it is not actually a potato but a swollen underground root.
Think of a plant that has a high food value, is easily grown, matures quickly, produces a lot of food for the planting space used, has good keeping qualities, and tastes nice. It sounds too good to be true. Yet the sweet potato has all of these qualities.