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  1. By: Al-Shehbaz, Ihsan A., (Ihsan Ali) - Schubert, Bernice Giduz
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 70
    Issue: 1
    Date: 1989
    Page Range: 57--95
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Fernald, Merritt Lyndon, - Schubert, Bernice Giduz
    Type: Article
    In: Rhodora
    Volume: 50
    Date: 1948
    Page Range: 149--176
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],