XXVI 



INTRODUCTION. 



IV. SIGNS USED IN THIS WOEK. 



(J) An annual plant. 

 (2) A biennial plant. 

 11, 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. J indicate that the species, or genus, is new, or has not been previously 

 u. gen. ) characterized. 



