Common Yellow Wood Sorrel (Oxalis stricta). Oxalidaceae. August 16, 2020 1500 × 1200 Common Yellow Wood Sorrel (Oxalis stricta). Oxalidaceae. Native. Meadows, fields, roadsides. Napeague, June 2019. Native. Meadows, fields, roadsides. Napeague, Long Island, June 2019.