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  1. By: Clark, John L. (John Littner) - Tobar Suárez, Diego Francisco - Keene, Jeremy
    Type: Article
    In: PhytoKeys
    Volume: 210
    Date: 2022
    Page Range: 15--21
    Publication Info: Pensoft Publishers 2022
  2. By: Keene, Jeremy - Ballard, Harvey E - Clark, John L. (John Littner)
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 5
    Date: 2011
    Page Range: 513--520
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-