a Eurasian plant, Oxalis acetosella, having trifoliate leaves, an underground creeping stem, and white purple-veined flowers: family Oxalidaceae
wood sorrel in American English
any of a genus (Oxalis, family Oxalidaceae) of creeping dicotyledonous plants (order Geraniales) with white,pink, red, or yellow, five-parted flowers and cloverlike compound leaves that containoxalic acid: found in cool, shaded, damp woods