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 few. 

 The signs are : 



for an annual plant. 

 (D " a biennial plant. 

 ^ 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. 



