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  1. By: Thomson, Paul M. - Mohlenbrock, Robert H
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 60
    Issue: 3
    Date: 1979
    Page Range: 350--366
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Thomson, Paul M.
    Type: Article
    In: Rhodora
    Volume: 79
    Date: 1977
    Page Range: 453--464
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],