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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: Knight, Paul J - Lucas, S G - Cully, A
    Type: Article
    In: Phytologia
    Volume: 85
    Issue: 5
    Date: 1998
    Page Range: 341--343
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke