202 . A TEXT-BOOK OF GRASSES 
Bromus erectus Panicum virgatum. 
Bromus arvensis. Panicum capillare. 
Bromus purgans. Panicum anceps. 
Festuca rubra. Panicum agrostoides. 
Festuca occidentalis. Panicum precocius. 
Festuca nutans. Panicum Wilcorianum. 
Festuca elatior. 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 Wernert. Whether or not the 
specific name takes one or two 1’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 Lindsaya Sarasinorum, for the brothers Sarasin. 
Occasionally a common noun is genitive plural, as Bromus 
tectorum. Further examples are given below: 
Panicum Huachuce. Eriogonum Thompson. 
Panicum tsugetorum. Panicum virgultorum. 
Panicum Leibergit. Viola viarum. 
Muhlenbergia Schrebert. Uromyces Trifoliz. 
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 Donaxz, 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-meduse. The 
two portions of the specific name are usually joined by a 
