SIGNS AND ABBREVIATIONS. 



(T). ...annual. 



(2) biennial. 



U . . ..perennial. 



$ staminate. 



$ pistillate. 



£ perfect. 



oo. . . .numerous ; more than 

 twenty when applied to 

 stamens. 



? doubt. 



! certainty. Indicates that 



the author has seen the 

 specimen in question. 



n. sp. new species. Used only 

 with the first printed 

 description. 



Eu. ..the Greek word "well," 

 sometimes written after a 

 species to indicate that it 

 is certainly a well-defined 

 species, not a variety. 



MEASUREMENT. 



° foot. 



' inch. 



" line^j inch). 



cm. ..centimeter. 



c.c. . .cubic centimeter. 



in. m. millimeter. 



jn....mu (the Greek letter m), 

 micromillimeter, T ^^ of 

 a millimeter, the unit 

 of microscopic measure- 

 ment. It is about .000039 

 of an inch. 



X • • ..used to express magnifica- 

 tion. Thus, X 150 indi- 

 cates a magnification of 

 150 diameters. The im- 

 proper fraction J-f^ indi- 

 cates the same, but this 

 form is little used. 



