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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Semple, J. C. 1994. New combinations in the Heterotheca villosa (Pursh) Shinners complex (Compositae: Asteraceae). Novon 4(1): 53–54.
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