Accepted By:
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Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York.
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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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