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  1. By: Porter, Duncan Macnair
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 53
    Issue: 4
    Date: 1972
    Page Range: 531--552
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Cuatrecasas, José - Porter, Duncan Macnair
    Type: Article
    In: Phytologia
    Volume: 26
    Date: 1973
    Page Range: 485--486
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  3. By: Porter, Duncan Macnair
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 54
    Issue: 2
    Date: 1973
    Page Range: 315--321
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  4. By: Porter, Duncan Macnair
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 53
    Issue: 3
    Date: 1972
    Page Range: 403--408
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-