Oxalis dillenii, the southern wood-sorrel,[1] slender yellow woodsorrel, or Dillen's oxalis, is a species in the woodsorrel family. Like other Oxalis species, the leaves of this plant resemble clover leaves, with three leaflets. The flowers have five yellow petals that are in length. The leaflets are wide with pointed hairs. The fruits are rather brown and are . It is often considered a weed, and can be found worldwide, but likely originated in North America.[2]