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                                 BOTANY

                                   OF

                      THE NORTHERN UNITED STATES.




                                 MANUAL
                                   OF
                               THE BOTANY
                                 OF THE
                        NORTHERN UNITED STATES,

           INCLUDING THE DISTRICT EAST OF THE MISSISSIPPI AND
                 NORTH OF NORTH CAROLINA AND TENNESSEE.


                              BY ASA GRAY,
    LATE FISHER PROFESSOR OF NATURAL HISTORY IN HARVARD UNIVERSITY.


                             Sixth Edition.


          REVISED AND EXTENDED WESTWARD TO THE 100th MERIDIAN,
                                   BY
                             SERENO WATSON,
           CURATOR OF THE GRAY HERBARIUM, HARVARD UNIVERSITY,
                                  AND
                            JOHN M. COULTER,
                 PROFESSOR OF BOTANY IN WABASH COLLEGE,

              _ASSISTED BY SPECIALISTS IN CERTAIN GROUPS_.


                        WITH TWENTY-FIVE PLATES,
             ILLUSTRATING THE SEDGES, GRASSES, FERNS, ETC.


                     IVISON, BLAKEMAN, AND COMPANY,
                             _PUBLISHERS_,
                        