1. Creeping Yellow Wood-sorrel: Oxalis corniculata - Weedy species of yards, gardens and disturbed places. Flowers yellow, the petals 4-9 mm long. Plants have creeping stems that root at the axils with the upright portion of the stem with green to purplish stems and leaves. Leaves trifoliate, the leaflets heart-shaped, with the point connected to the petiole.

2. Yellow Wood-sorrel, Common Yellow Oxalis: Oxalis stricta -