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  1. By: Robinson, Harold Ernest, - Powell, A Michael - King, Robert M - Weedin, James F
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 72
    Date: 1985
    Page Range: 469--479
    Publication info: St. Louis :Missouri Botanical Garden Press,1914-
  2. By: Powell, A Michael - Weedin, James F
    Type: Article
    In: SIDA, contributions to botany.
    Volume: 21
    Date: 2005
    Page Range: 1665--1668
    Publication info: [Dallas :W. F. Mahler, etc.]1962-