Reference:Stuessy1973b
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Verbatim text: Stuessy, T. F., R. S. Irving, and W. L. Ellison. 1973. Hybridization and evolution in Picradeniopsis (Compositae). Brittonia 25: 40–56.
Author: Stuessy, T.F., Irving, R.S., Ellison, W.L.
Year: 1973
Title: Hybridization and evolution in Picradeniopsis (Compositae)
Journal: Brittonia
Volume: 25
Pages: 40–56