Accepted By:
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Flora of North America Editorial Committee. 2019. Magnoliophyta: Tetrachondraceae to Orobanchaceae. 17: i–xxiv, 1–737. In Fl. N. Amer.. Oxford University Press, New York.
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Voss, E. G. 1996. Michigan Flora, Part III: Dicots (Pyrolaceae-Compositae). Cranbrook Inst. of Science, Ann Arbor.
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