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  1. By: Barr, M E
    Type: Article
    In: Contributions from the University of Michigan Herbarium.
    Volume: 9
    Date: 1972
    Page Range: 523--638
    Publication info: Ann Arbor :University Herbarium, University of Michigan,1939-
  2. By: Barr, M E
    Type: Article
    In: Rhodora
    Volume: 78
    Date: 1976
    Page Range: 53--59
    Publication info: [Cambridge, Mass., etc.]New England Botanical Club [etc.]