600 Rydbekg : Rocky Mountain flora 



able. The generic name Vilfa is not available, for the type of 

 Vilfa Adans. is apparently a species of Agrostis. As there is no 

 character, whatever, to separate these plants from MiiJilcnbergia 

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

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

 neric with M. WrigJitii Vasey, slender specimens of which are 

 very hard to distinguish from M. aispidata here proposed. The 

 other Rocky Mountain species are : 



Muhlenbergia Richardsonis (Trin.) Rydb. 



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



103. 1840. 

 '> Agrostis hrcvifolia Nutt. Gen. i : 44. 18 18. 



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

 species, but it is doubtful if Agrostis hrcvifolia 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. 



Sporoholus simplex Scribn. Bull. U. S. Div. Agrost. ii : 48. 

 1898. 



Muhlenbergia filiformis (Thurber) Rydb. 



Vilfa dcpaupcrata filifornns Thurb.; S. Wats. Bot. King's ExpL 



376. 1871. 

 Vilfa gracillinia Thurb. Bot. Calif. 2: 268. 1880. Not Mnh- 



lenhergia gracillinia Torr. 1856. 

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



1895. 



Muhlenbergia aristulata Rydb. 



Sporoholus aristatus Rydb. Bull. Torrey Club 28: 266. 1 90 1. 

 Not Muhlcnhcrgia aristata Pers. 1805. 



Muhlenbergia Wolfii (Vasey) Rydb. 



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



minima Trin. 1855. 

 Sporoholus Wolfii W 3iSty , Bull. Torrey Club 10 : 52. 1883. 



