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  1. By: Spellenberg, Richard - Worthington, Richard D., - Knight, Paul J - Fletcher, Reggie A
    Type: Article
    In: SIDA, contributions to botany
    Volume: 11
    Date: 1986
    Page Range: 455--470
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  2. By: Fletcher, Reggie A - Wagner, Warren Lambert
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 31
    Date: 1984
    Page Range: 20--23
    Publication Info: Berkeley, California Botanical Society,