Verbatim text: Olsen, J. S. 1979. Taxonomy of the Verbesina virginica complex (Asteraceae). Sida 8: 128–134.
Author: Olsen, J.S.
Year: 1979
Title: Taxonomy of the Verbesina virginica complex (Asteraceae)
Journal: Sida
Volume: 8
Pages: 128–134