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  1. By: Plowman, Amon B
    Type: Article
    In: Annals of botany
    Volume: 20
    Date: 1906-01
    Page Range: 1--33
    Publication Info: London, Academic Press [etc.],
  2. By: Plowman, Amon B
    Type: Article
    In: Botanical gazette
    Volume: 60
    Issue: 3
    Date: 1915
    Page Range: 169--192
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991