INTRODUCTION. 



IV. SIGNS USED IN THIS WORK. 



(^ An annual plant. 

 (9) A biennial plant. 

 y. A perennial plant. 



o 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. 



