Creeping Yellow Wood-sorrel, Creeping Yellow Wood-sorrel: Oxalis corniculata (Synonym: Oxalis violacea) - 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.
Graygreen Sorrel, Slender Yellow Wood-sorrel, Southern Yellow Wood Sorrel: Oxalis dillenii (Synonym: Oxalis corniculata var. dillenii)
Common Yellow Oxalis, Yellow Wood-sorrel: Oxalis stricta (Synonyms: Oxalis ambigua, Oxalis bushii, Oxalis coloradensis, Oxalis cymosa, Oxalis europaea, Oxalis fontana, Oxalis interior, Oxalis rufa) -