Reference:Hartman1976a
Verbatim text: Hartman, R. L. 1976. A Conspectus of Machaeranthera (Compositae: Astereae) and a Biosystematic Study of the Section Blepharodon. Ph.D. dissertation. University of Texas.
Author: Hartman, R.L.
Year: 1976
Title: A Conspectus of Machaeranthera (Compositae: Astereae) and a Biosystematic Study of the Section Blepharodon