''Vernonia lettermannii'', the narrowleaf ironweed, is a plant species known only from

Arkansas Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage ...

and

Oklahoma Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...

. It grows on floodplains and terraces at elevations of . ''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 Corymb is a botanical term for an inflorescence with the flowers growing in such a fashion that the outermost are borne on longer pedicels than the inner, bringing all flowers up to a common level. A corymb has a flattish top with a superficial re ...

.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.

References

{{Taxonbar, from=Q15567135 lettermannii Flora of Arkansas Flora of Oklahoma Flora without expected TNC conservation status