Accepted By:
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. 21: i–xxii, 1–616. In Fl. N. Amer.. Oxford University Press, New York.
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Long, R. W. & O. K. Lakela. 1971. Fl. Trop. Florida i–xvii, 1–962. University of Miami Press, Coral Cables.
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