Oxalis stricta, Common Yellow Woodsorrel
The Cherokee, Iroquois, Meskwaki, Omaha, Pawnee, and Ponca Nations were reported to consume the leaves for sustenance. The quantities were low and mostly for flavor due to the oxalic acid content. The Iroquois made infusions for fever, cramps, and headaches. The Menominee and Meskwaki Nations made dyes by boiling the entire plant.
While not the same chemical compound as citrus, when consumed, the leaves of O. stricta have a sour citrus-like taste and make for a great pallet cleansing snack.