Lemon clover, yellow woodsorrel, sourgrass, are some of the common names used for Oxalis stricta.
You will most likely find this plant in your lawn or garden and may have nibbled on it’s lovely, heart shaped, sour leaves.
All parts of the plant are edible. The leaves and flowers of the plant can be added to salads for decoration and flavoring. They can also be used as stuffing for fish giving it a lemony flavor.