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  1. By: Felger, Richard Stephen - Wiens, John F - Smith, S Galen - Laferriere, Joseph E - Mastrogiuseppe, Joy D. - Old, Richard R - Zika, Peter F. - Halse, Richard R. - Roché, Cindy T
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 40
    Date: 1993
    Page Range: 178--186
    Publication Info: Berkeley, California Botanical Society,
  2. By: Mckenzie, Paul M - Smith, S Galen - Smith, Marian
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 1
    Date: 2007
    Page Range: 457--481
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-