For Verbesina
Coleman, J.R. 1966. A taxonomic revision of section Ximenesia of the genus Verbesina (Compositae). Amer. Midl. Naturalist 76: 475-481. Google Scholar
Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C. Google Scholar
Olsen, J. 1979. Taxonomy of the Verbesina virginica complex (Asteraceae). Sida 8: 128-134. Google Scholar
Strother, J.L. 2006oo. Verbesina. In Flora of North America Editorial Committee. 2006c. Flora of North America north of Mexico. Volume 21, Magnoliophyta: Asteridae, part 6: Asteraceae, part 3. Oxford Univ. Press, New York, NY. 616 pp. Google Scholar