V. M. Spalding, Professor in the University of Michigan:—"I regard the book as one that we cannot do without and one that will henceforth take its place as a necessary means of determination of the plant species within its range."

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TRANSCRIBER'S NOTES

  1. Corrected the ERRATA listed on p. [xxiii] with the exception of the table of changes in generic names.
  2. Silently corrected simple spelling, grammar, and typographical errors.
  3. Retained anachronistic and non-standard spellings as printed.