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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Towner, Howard F
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 64
    Date: 1977
    Page Range: 48--120
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Towner, Howard F - Raven, Peter H
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 20
    Date: 1970
    Page Range: 241--245
    Publication Info: Berkeley, California Botanical Society,