Accepted By:
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Flora of North America Editorial Committee. 2006. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. 20: i–xxii, 1–666. In Fl. N. Amer.. Oxford University Press, New York.
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Kartesz, J. T. & K. N. Gandhi. 1991. Nomenclatural notes for the North American Flora. VI. Phytologia 71(1): 58–65.
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