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  1. By: Wahlert, Gregory A - Ballard, Harvey E
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 19
    Date: 2009
    Page Range: 416--420
    Publication Info: St. Louis, MO, Missouri Botanical Garden,
  2. By: Wahlert, Gregory A - Parker, V Thomas - Vasey, Michael C.
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 3
    Date: 2009
    Page Range: 673--682
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-