Have you noticed whether this plant is rooting at the leaf notes or not? Glycine microphylla is also present in the CNM area, and roots at the nodes. Glycine clandestina does not. A clear closeup of a leaf showing whether the veins are obvious (microphylla) or not (clandestina) would help. The central leaflet of microphylla has a short stalk, while that of clandestina does not. Field notes instead of photos are OK.