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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Rothrock, Paul E
    Type: Article
    In: Rhodora
    Volume: 77
    Date: 1975
    Page Range: 538--539
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Bryson, Charles T. - Rothrock, Paul E
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 4
    Date: 2010
    Page Range: 347--348
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-