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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Douglas, G W - Taylor, R. J.
    Type: Article
    In: Rhodora
    Volume: 72
    Date: 1970
    Page Range: 496--501
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Douglas, G W
    Type: Article
    In: Proceedings of the Linnean Society of New South Wales
    Volume: 86
    Date: 1962
    Page Range: 262--267
    Publication Info: Sydney Linnean Society of New South Wales