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  1. By: Cornejo, Xavier - Iltis, Hugh H. - Tomb, A. Spencer
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 2
    Date: 2008
    Page Range: 61--74
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-
  2. By: Gentry, Alwyn H. (Alwyn Howard) - Tomb, A. Spencer
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 66
    Date: 1979
    Page Range: 756--777
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  3. By: Tomb, A. Spencer
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 21
    Date: 1972
    Page Range: 459--462
    Publication Info: Berkeley, California Botanical Society,