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  1. By: Tittmann, O. H. (Otto Hilgard),
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  1. By: Tittmann, O. H. (Otto Hilgard),
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 47
    Issue: 188
    Date: 1908
    Page Range: 86--90
    Publication Info: Philadelphia, American Philosophical Society,