Vernonia lettermannii

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 –.

Vernonia lettermannii is a perennial herb up to 60 cm tall. Leaves are filiform (thread-shaped), up to 9 cm long but less than 3 mm wide. Flower heads are purple, arranged as a corymb.