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• A Flora of North America: containing abridged descriptions of all the known indigenous and naturalized plants growing north of Mexico ; arranged according to the natural system / by John Torrey ... and Asa Gray ...

  Herzogin Anna Amalia Bibliothek

  1838-1841

  Gray, Asa

• Comprising the polypetalous division of the dicotyledonous or exogenous plants

  Herzogin Anna Amalia Bibliothek

  1838-1840

  Gray, Asa · Hooker, William Jackson (Widmungsempfänger)

• A Flora of North America: containing abridged descriptions of all the known indigenous and naturalized plants growing north of Mexico; arranged according to the natural system / John Torrey; Asa Gray

  Herzogin Anna Amalia Bibliothek

  1841-1843

  Gray, Asa