PREFACE. 11 



*** In revising the sheets for the present impression, many small errors 

 of the press, most of them relating to accentuation, have now been cor- 

 rected. 



January, 1870. 



SIGNS AND ABBREVIATIONS. 



THE SIGNS AND ABBREVIATIONS employed in this work are ftw. 



The signs are : 



for an annual plant. 



@ " a biennial plant. 

 2/ u a perennial plant. 



The signs for degrees, minutes, and seconds are used for feet, inches, 

 and lines, the latter twelve to the inch. 



Thus 1 means a foot in length or height, &c. ; 2', two inches ; 3", three 

 lines, or a quarter of an inch. The latter sign is seldom used in this work. 

 The dash between two figures, as " 5-10," means from five to ten, &c. 

 " Fl." stands for flowers or flowering. 

 " Cult." " for cultivated. 

 " Nat." " for naturalized. 



" N., E., S., W." for North, East, South, and West. 

 The geographical abbreviations, such as "Eu." for Europe, and the 

 common abbreviations for the names of the States, need no particular 

 explanation. 



