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  1. By: Siver, P A
    Type: Article
    In: Rhodora
    Volume: 80
    Date: 1978
    Page Range: 417--430
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  2. By: Hamilton, P B - Siver, P A - Reimer, C W
    Type: Article
    In: Rhodora
    Volume: 106
    Date: 2004
    Page Range: 33--42
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]