xxvi 



INTRODUCTION. 



Tourn. 



Trin. 



Tuck. 



Vent. 



Wahl. 



Wang. 



Walt. 



WaUr. 



Wendl. 



WiM. 



Tournefort, 



Trinius. 



Tuckerman. 



Ventenat. 



Wahlenberg. 



Wangenheim. 



Walter. 



Wallroth. 



Wendland. 



Willdenow. 



IV. SIGNS USED IN THIS WORK. 



(1) An annual plant. 



(2) A biennial plant. 

 1J. A perennial plant. 



The length in feet; as, " 2 long," two feet long. 

 ' The length in inches ; as, " 2' long," two inches long. 

 " The length in lines; as, "2" long," two lines long. 

 (*) Placed at the end of a specific character, denotes that the species is not well 



known. 



Two adjectives connected by a hyphen denote a form intermediate between the 

 two; as, "ovate-lanceolate," between ovate and lanceolate. 



Two figures connected by a dash, as " stem 4- 6 long," denote that the length 

 of the stem varies from four to six feet. 



n. sp. ) indicate that the species, or genus, is new, or has not been previously 

 n. gen. ) characterized. 



