254 A TEXT-BOOK OF GRASSES 



vided there is not already in that genus a species with the 

 same name. If the specific name is an adjective its end- 

 ing must be changed when necessary to agree in gender 

 with the new genus. Thus Panicum frumentaceum becomes 

 Echinochloa frumentacea. 



AUTHORS OF NAMES 



277. The student will observe after the name of a 

 genus or species, where these are written formally, the 

 name of a person either in full or abbreviated. This is 

 the name of the author of the genus or species, that is, 

 the name of the person first describing the genus or spe- 

 cies, or who first applied to these groups the name as it 

 stands. For convenience the name of the author is usually 

 abbreviated unless it consists of one syllable, or is not 

 often used, or unless its abbreviation would be ambiguous. 



A few common abbreviations are given below. The 

 name is usually abbreviated to the vowel of the second 

 syllable. A few well-known names are further abbreviated. 



Beauv. — Beauvois. 



R. Br. — Robert Brown. 



DC— De CandoUe. 



EU.— EUiott. 



H.B.K. or HBK.— Humboldt, Bonpland and Kunth. 



L. or Linn. — Linnaeus or Linne. 



Michx. — Michaux. 



Muhl. — Muhlenberg. 



Nutt.— Nuttall. 



Torr. — Torrey. 



Walt.— Walter. 



278. Use of parentheses. — Recent custom sanctions 

 the use of the parentheses to indicate the original author 

 of a specific or varietal name. A name written thus, 



