Vernonia lettermannii

Vernonia lettermannii, the narrowleaf ironweed,^[2] is a plant species known only from Arkansas and Oklahoma. It grows on floodplains and terraces at elevations of 100–200 m (330–660 ft).^[3]

Vernonia lettermannii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Vernonia
Species:	V. lettermannii
Binomial name
Vernonia lettermannii Engelm. ex A. Gray
Synonyms[1]
Cacalia lettermannii (Engelm. ex A. Gray) Kuntze

Vernonia lettermannii is a perennial herb up to 60 cm (24 in) tall. Leaves are filiform (thread-shaped), up to 9 cm (3.5 in) long but less than 3 mm (0.12 in) wide. Flower heads are purple, arranged as a corymb.^[4][5][6]