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JSTOR, 1989
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Missouri Botanical Garden, 1989
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JSTOR, 1987
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Missouri Botanical Garden, 1987
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JSTOR, 1985
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Missouri Botanical Garden, 1985
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JSTOR, 1989
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Springer Science and Business Media LLC, 1998
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New York Botanical Garden, 1998
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Wiley, 1991
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International Bureau for Plant Taxonomy and Nomenclature, 1991
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JSTOR, 1991
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Missouri Botanical Garden, 1991
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Wiley, 1991
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International Bureau for Plant Taxonomy and Nomenclature, 1991
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Missouri Botanical Garden, 1989
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JSTOR, 1989
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Biodiversity Heritage Library, 1988
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Arnold Arboretum of Harvard University, 1988
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JSTOR, 1990