252 A TEXT-BOOK OF GRASSES 



Bromus erectus Panicum virgatum. 



Bromus arvensis. Panicum capillare. 



Broinus purgans. Panicum anceps. 



Festuca rubra. Panicum agrostoides. 



Fesluca occidentalis. Panicum prsecocius. 



Festuca nutans. Panicum Wilcoxianum. 



Festuca elaiior. Panicum tennesseense. 



273. Nouns in the genitive. — Specific names in the 

 genitive are usually in the singular and are usually proper 

 names. It is common for botanists to name a plant for 

 the collector, as Panicum Werneri. Whether or not the 

 specific name takes one or two i's in the genitive is a matter 

 of taste or euphony. If the name Smith is latinized to 

 Smithus in the nominative it becomes Smithi in the 

 genitive; if it is latinized to Smithius, it becomes Smithii. 

 In rare cases the genitive plural is used for personal 

 names, as Ldndsaya Sarasinorum, for the brothers Sarasin. 

 Occasionally a common noun is genitive plural, as Bromus 

 tectorum. Further examples are given below: 



Panicum Huuchu^se. Eriogonum Thompsons, 



Panicum tsugetorum. Panicum. virgultorum, 



Panicum Leibergii. Viola viarum. 



Muhlenbergia Schreberi. Uromyces Trifolii, 

 Agropyron Richardsonis. 



274. Nouns in apposition are not inflected when used 

 as specific names since they are always in the nominative 

 case. Such specific names are usually old generic or other 

 proper names, as Arundo Donax, Capriola Dactylon, Hys- 

 trix Hystrix and Achillea Millefolium. There are a few 

 specific names that consist of two words, the first in the 

 nominative and the second in the genitive, as Echinochloa 

 Crus-galli, Apera spica-venti, Elymus caput-medusce. The 

 two portions of the specific name are usually joined by a 



