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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Johnson, David M. - Murray, Nancy A
    Type: Article
    In: Contributions from the University of Michigan Herbarium
    Volume: 22
    Date: 1999
    Page Range: 95--104
    Publication Info: Ann Arbor, University Herbarium, University of Michigan, 1939-
  2. By: Johnson, David M. - Murray, Nancy A
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 77
    Date: 1990
    Page Range: 598--600
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-