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  1. By: Jansen, Robert - Parfitt, Bruce
    Type: Article
    In: Rhodora
    Volume: 79
    Date: 1977
    Page Range: 130--132
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Baker, Marc A. - Rebman, Jon Paul - Parfitt, Bruce - Pinkava, Donald - Christy, Charlotte M. - Salywon, Andrew M., - Puente-Martinez, Raul - Cota, J. Hugo - Zimmerman, Allan
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 3
    Date: 2009
    Page Range: 279--283
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-
  3. By: Baker, Marc A. - Pinkava, Donald J - Parfitt, Bruce - Righetti, Timothy
    Type: Article
    In: The Great Basin naturalist
    Volume: 44
    Date: 1984
    Page Range: 484--486
    Publication Info: Provo, Utah, M.L. Bean Life Science Museum, Brigham Young University,