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, e. 2002. Magnoliophyta: Liliidae: Liliales and Orchidales. 26: i–xxvi, 1–723. In Flora of North America Editorial Committee (eds.) Fl. N. Amer.. Oxford University Press, New York.
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Gleason, H. A. & A. J. Cronquist. 1968. The Pteridophytoa, Gymnospermae and Monocotyledoneae. 1: 1–482. In H. A. Gleason Ill. Fl. N.E. U.S.. New York Botanical Garden, New York.
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Gleason, H. A. & A. J. Cronquist. 1991. Man. Vasc. Pl. N.E. U.S. (ed. 2) i–910. New York Botanical Garden, Bronx.
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Radford, A. E., H. E. Ahles & C. R. Bell. 1968. Man. Vasc. Fl. Carolinas i–lxi, 1–1183. University of North Carolina Press, Chapel Hill.
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