Accepted By:
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Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.
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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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