The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

• Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville.
• Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
• Cronquist, A. J. 1980. Asteraceae. 1: i–xv, 1–261. In Vasc. Fl. S.E. U. S. The University of North Carolina Press, Chapel Hill.
• Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
• Flora of North America @ eFloras.org
• Flora of North America Editorial Committee, e. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii + 1–666. In Fl. N. Amer. Oxford University Press, New York.
• Gleason, H. A. & A. Cronquist. 1991. Man. Vasc. Pl. N.E. U.S. (ed. 2) i–lxxv, 1–910. New York Botanical Garden, Bronx.
• Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N. U.S. (ed. 3). New York Botanical Garden, New York.
• Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence.
• Hickman, J. C. 1993. Jepson Man.: Higher Pl. Calif. i–xvii, 1–1400. University of California Press, Berkeley.
• Munz, P. A. 1968. Suppl. Calif. Fl. 1–224. University of California Press, Berkeley.
• Munz, P. A. 1974. Fl. S. Calif. 1–1086. University of California Press, Berkeley.
• Rolfsmeier, S. B., R. B. Kaul & D. M. Sutherland. 1987. New and corrected records of the Flora of Nebraska. Trans. Nebraska Acad. Sci. 15: 49–52.
• Type collection: Walter, T. 1788. Fl. Carolina. 209.
• Voss, E. G. 1996. Michigan Flora, Part III: Dicots (Pyrolaceae-Compositae). Cranbrook Inst. of Science, Ann Arbor.