600 RvDBERG : Rocky Mountain flora 



As there is no 



able. The generic name Vilfa is not available, 

 Vilfa Adans. is apparently a species of Agrostis, 

 character, whatever, to separate these plants from Muhh 

 as now limited, the only rational way to treat them at present is to 

 transfer them all to Miihlenbcrgia. At any rate, they are conge- 

 neric with M. Wri^Jitii Vasev, slender specimens of which are 



6 



other Rocky Mountain species are : 



^pidata here proposed. The 



/Muhlenbergia Richardsonis (Trin.) Rydb. 



Vilfa Richardsonis Trin. Mem, Acad. St. Petersb. VI. Nat. 5^: 



103. 1840. 

 7 Agrostis bmnfolia Nutt. Gen. 1 : 44, 1818. 



The specific name hrevifolia may have to be taken up for this 

 species, but it is doubtful if Agrosiis hrevifolia is a synonym of this. 

 Professor Scribner claims that it belongs to the preceding species. 

 What Vilfa Richardsonis Trin. is, is not doubtful, and that specific 

 name is therefore preferable. 



Muhlenbergia simplex (Scribn.) Rydb. 

 Sporobolus simplex Scribn. Bull. U. S. Div. Agrost. II : 48. 



1898. 



Muhlenbergia filiformis (Thurber) Rydb. 



Vilfa depauperata filiformis Thurb.; S. Wats. Bot. King's Expl 



376- 1871. 

 Vilfa gracillima Thurb. Bot. Calif. 2: 268. 1880. Not Muh 



m 



le fiber gia gracillima To rr. 1856. 

 Sporolwlus filiformis Rydb. Contr. U. S. Nat. Herb. 3: 189 



1895. 



Muhlenberg 



Sporobolus aristatus Rydb. Bull. Torrey Club 28: 266. 1901 

 Not Muhlenbergia aristata Pers. 1805. 



»/ Muhlenbergia Wolfii (Vasey) Rydb. 



Vilfa minima Vasey, Bot. Wheeler Surv. 282. 1878. Not V. 

 jninitna Trin. 1855. 



Sporobolus Wolfii W^s^y, Bull. Torrey Club 10: 52. 1883. 



