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  1. By: Ascherson, Paul Friedrich August, - Urban, Ignaz, - Graebner, Paul,
    Publication info: Leipzig :Verlag von Gebrüder Borntraeger,1904.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  2. By: Ascherson, Paul Friedrich August, - Graebner, Paul,
    Publication info: Leipzig,W. Engelmann,1896/98-
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden