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  1. By: Callaghan, Christopher B.
    Type: Article
    In: Arnoldia
    Volume: 66
    Issue: 3
    Date: 2009
    Page Range: 15--25
    Publication Info: Jamaica Plain, Mass Arnold Arboretum, Harvard University
  2. By: Callaghan, Christopher B. - Png, Siak
    Type: Article
    In: PhytoKeys
    Volume: 146
    Date: 2020
    Page Range: 1--35
    Publication Info: Pensoft Publishers 2020