Interesting ! I appreciate the link, it sounds like basically that's what I'm after up here in zone 5/6 except Arachis pintoi is more in the tropics? !
Amphicarpaea bracteata from my understanding is "hog peanut" .
I have noticed this plant in areas other large trees will not be growing in. After moving through the area I will visible see water soaking into my tracks in the snow.
Any ideas? Seems like a great area to explore in the spring and "develop" with other species.