Oxalis spp.; wood-sorrel [Oxalidaceae]  Five species of low, trailing or erect herbs with small, 5-petaled, yellow, white, pink, or purple flowers.  Leaves compound, with 3 heart-shaped leaflets.  Oxalic acid, which gets its name from this family, gives the leaves a sour taste.  O. corniculata is an introduced species that has become an abundant weed in Wisconsin flower beds.  Our four native species range from open ground to shady woods, with flowering time dependent on the species.  [055]

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