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  1. By: Naczi, Robert F C - Soper, Eric M - Case, Frederick W - Case, Roberta B
    Type: Article
    In: SIDA, contributions to botany.
    Volume: 18
    Date: 1999
    Page Range: 1183--1206
    Publication info: [Dallas :W. F. Mahler, etc.]1962-
  2. By: Case, Frederick W
    Type: Article
    In: Rhodora
    Volume: 58
    Date: 1956
    Page Range: 203--207
    Publication info: [Cambridge, Mass., etc.]New England Botanical Club [etc.]