Vernonia lettermannii

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
	Cacalia lettermannii (Engelm. ex A. Gray) Kuntze

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 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]

References

^ Tropicos
^ USDA, NRCS (n.d.). "Vernonia lettermannii". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 29 July 2015.
^ Flora of North America
^ 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.

[1] Tropicos

[2] USDA, NRCS (n.d.). "Vernonia lettermannii". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 29 July 2015.

[3] Flora of North America

[4] Gray, Asa. Notes on Some Compositae 78. 1880.

[5] Robinson, H. 1999. Generic and subtribal classification of American Vernonieae. Smithsonian Contributions in Botany 89: i–iii, 1–116.

[6] 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.

[1]

[2]

[3]

[4]

[5]

[6]