Wood Sorrel

wood sorrel Oxalis acetosella, a wild plant of Europe and N. America whose leaves are more bitter than those of true sorrel but are nonetheless eaten as a green vegetable, or added in small quantities to salads. There are numerous related species of which the same can be said; but the important member of the genus is O. tuberosa, prized for its edible tuber rather than its leaves, and known as oca.