Oxalis illinoensis, the Illinois woodsorrel, is a species of flowering plant in the woodsorrel family (Oxalidaceae).[1] It is endemic to the United States, where it found in Illinois, Indiana, Kentucky, and Tennessee.[1] The limits of the range of this species are unclear due to its similarity to Oxalis grandis, with which there has been confusion.[2]
Oxalis illinoensis is a perennial that produces yellow flowers with red-lined centers. Its primary habitat is calcareous forests and bluffs.