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  1. By: Rogers, George K
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 42
    Date: 1995
    Page Range: 123--126
    Publication Info: Berkeley California Botanical Society
  2. By: Rogers, George K - Yungjohann, John C - Prance, Ghillean T. (Ghillean Tolmie),
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 77
    Date: 1990
    Page Range: 605
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-