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  1. By: Sawyer, John O. (John Orvel), - Thornburgh, Dale A. - Bowman, W. F.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 20
    Date: 1970
    Page Range: 413--415
    Publication Info: Berkeley, California Botanical Society,
  2. By: Riegel, Gregg M - Thornburgh, Dale A. - Sawyer, John O. (John Orvel),
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 37
    Date: 1990
    Page Range: 88--112
    Publication Info: Berkeley, California Botanical Society,