The limits of the range of this species are unclear due to its similarity to Oxalis grandis, with which there has been confusion.
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Oxalis illinoensis the Illinois Woodsorrel, is a species of flowering plant in the woodsorrel family.
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It is native to the United States, where it is endemic to the Interior Low Plateaus of Illinois, Indiana, Kentucky, and Tennessee.
Oxalis | Oxalis pes-caprae | Photonastic movement of ''Oxalis triangularis | Oxalis tetraphylla | Oxalis rubra | Oxalis grandis | ''Oxalis acetosella'' growing at Phoenix Park |