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  1. By: Kurz, H - Kubitzki, K - Richter, H G
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 60
    Issue: 4
    Date: 1979
    Page Range: 515--522
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Werff, Henk van der - Richter, H G
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 83
    Date: 1996
    Page Range: 409--418
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-