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  1. By: Pfitzer, Ernst Hugo Heinrich,
    Publication info: Heidelberg, C. Winter's Universitätsbuchh, 1887
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
  2. By: Pfitzer, Ernst Hugo Heinrich,
    Publication info: Heidelberg, C. Winter, 1894
    Holding Institution: Harvard University Botany Libraries
  3. By: Pfitzer, Ernst Hugo Heinrich,
    Publication info: Leipzig : Verlag von Wilhelm Engelmann (Druck von Breitkopf & Härtel in Leipzig), 1903
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  4. By: Kraenzlin, Fritz, - Pfitzer, Ernst Hugo Heinrich,
    Publication info: Leipzig : Verlag von Wilhelm Engelmann (Druck von Breitkopf & Härtel in Leipzig), 1907
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid