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Oxalis corniculata, the Procumbent Yellow Sorrel or Yellow Wood Sorrel, is a somewhat delicate-appearing, low-growing, herbaceous plant in the family Oxalidaceae. It has a narrow, creeping stem that readily roots at the nodes. The trifoliate leaves are subdivided into three rounded leaflets and resemble a clover in shape. Some varieties have green leaves, while others have purple leaves, like the Oxalis corniculata var. atropurpurea shown here. The leaves have inconspicuous stipules at the base of each petioles.
The fruit is a narrow, cylindrical capsule, 1 to 2 cm long and noteworthy for its explosive discharge of the contained, 1 mm long seeds.
This species is cosmopolitan in its distribution, and its place of origin is unknown. It is regarded as weed in garden plots.
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