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  1. By: Fryxell, Paul A. - Krapovickas, A
    Type: Article
    In: Contributions from the University of Michigan Herbarium
    Volume: 17
    Date: 1990
    Page Range: 173--182
    Publication Info: Ann Arbor, University Herbarium, University of Michigan, 1939-
  2. By: Fryxell, Paul A. - Krapovickas, A
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 14
    Date: 2004
    Page Range: 58--69
    Publication Info: St. Louis, MO, Missouri Botanical Garden,