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Oxford; New York: Oxford Univ. Pr., 2001
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Wiley, 1971
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Duke University Press, 1971
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Informa UK Limited, 1977
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Biodiversity Heritage Library, 1976
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Southwestern Association of Naturalists, 2012
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Southwestern Association of Naturalists, 2012
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Botanical Research Institute of Texas, 2003
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California Botanical Society, 2000
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Botanical Research Institute of Texas, 2012
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California Botanical Society, 1993