Vernonia lettermannii explained

Vernonia lettermannii, the narrowleaf ironweed, is a plant species known only from Arkansas and Oklahoma. It grows on floodplains and terraces at elevations of 100–.^[1]

Vernonia lettermannii is a perennial herb up to 60cm (20inches) tall. Leaves are filiform (thread-shaped), up to 9cm (04inches) long but less than 3mm wide. Flower heads are purple, arranged as a corymb.^{[2] [3] [4]}

Notes and References

1. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067807 Flora of North America
2. Gray, Asa. Notes on Some Compositae 78. 1880.
3. Robinson, H. 1999. Generic and subtribal classification of American Vernonieae. Smithsonian Contributions in Botany 89: i–iii, 1–116.
4. 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.