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  1. By: Conwentz, Hugo Wilhelm,
    Publication info: Cambridge [England] :University Press,1909.
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: Harvard University Herbarium, Botany Libraries
  2. By: Dahl, Friedrich, - Conwentz, Hugo Wilhelm,
    Publication info: Berlin :Gebr. Borntraeger,1912.
    Holding Institution: Smithsonian Libraries