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  1. By: Exell, A W
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 20
    Issue: 3
    Date: 1939
    Page Range: 317-320
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Exell, A W
    Type: Article
    In: Mitteilungen der Botanischen Staatssammlung München
    Volume: 10
    Date: 1971
    Page Range: 69--70
    Publication Info: Munich, H. Merxmüller, [1950]-1991 [i.e. 1992]
  3. By: Exell, A W
    Type: Article
    In: Mitteilungen der Botanischen Staatssammlung München
    Volume: 4
    Date: 1961
    Page Range: 3--7
    Publication Info: Munich, H. Merxmüller, [1950]-1991 [i.e. 1992]