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Ulmus americana fo. alba (Aiton) Fernald
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Ulmus americana fo. ascendens A.D. Slavin
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Ulmus americana fo. columnaris Rehder
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Ulmus americana fo. intercedens Fernald
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Ulmus americana fo. laevior Fernald
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Ulmus americana fo. pendula (Aiton) Fernald
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Ulmus americana fo. viridis F. Seym.
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Ulmus americana var. aspera Chapm.
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Sherman-Broyles, S. L. 1992. Ulmaceae, Genus Ulmus. 26 pp.
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Ulmus americana var. floridana (Chapm.) Little
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Sherman-Broyles, S. L. 1992. Ulmaceae, Genus Ulmus. 26 pp.
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Ulmus floridana Chapm.
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Flora of North America Editorial Committee, e. 1997. Magnoliidae and Hamamelidae. 3: i–xxiii, 1–590. In Fl. N. Amer.. Oxford University Press, New York.
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Sherman-Broyles, S. L. 1992. Ulmaceae, Genus Ulmus. 26 pp.
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