Vernonia lettermannii, the narrowleaf ironweed, is a plant species known only from Arkansas and Oklahoma. It grows on floodplains and terraces at elevations of .Flora of North America
Vernonia lettermannii is a perennial herb up to tall. Leaves are filiform (thread-shaped), up to long but less than wide. Flower heads are purple, arranged as a corymb.Gray, Asa. Notes on Some Compositae 78. 1880.Robinson, H. 1999. Generic and subtribal classification of American Vernonieae. Smithsonian Contributions in Botany 89: i–iii, 1–116.Cronquist, A.J. 1980. Asteraceae. 1: i–xv, 1–261. In Vascular Flora of the Southeastern United States. The University of North Carolina Press, Chapel Hill.
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