I like the comment by Eve Emshwiller in the interesting article http://whyfiles.org/2012/farming-native-american-style  looking at how to learn from how the Native Americans had developed stable, sophisticated food-gathering systems:
“There were a lot of people who were not considered agriculturalists, who were [supposedly] just gathering from the wild. But if you really understand what they were doing, there is not a sharp line between gathering and farming. There is a huge continuum of ways that people manage resources and get more from them.”  This is a message that I try to get across in my book where many examples are given of this continuum between foraging and gardening.

I grow a couple of the wild gathered tubers mentioned in the article. First, Riceroot is a really hardy edimental  and an important foraged food plant across its range (the first group of pictures below). The last three pictures are of Hog peanut (Amphicarpaea bracteata).

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