Verbatim text: Turner, B. L. and R. L. Hartman. 1976. Infraspecific categories of Machaeranthera pinnatifida (Compositae). Wrightia 5: 308–315.
Author: Turner, B.L., Hartman, R.L.
Year: 1976
Title: Infraspecific categories of Machaeranthera pinnatifida (Compositae)
Journal: Wrightia
Volume: 5
Pages: 308–315