102 Rydberg: Studies on the Rocky Mountain flora 



arifolia Nutt.,*and 5. arifolia tenuior is but a depauperate form of 

 the same. Both 5. paniciilata Blank, and 6'. arifolia Nutt. have 

 to give way for the older name S. cuneata Sheldon, f which was 

 described from the deep-water form of the same species. 



POACEAE 



Blankinship reported Panicum ?iitidum Lam. from Columbia 

 Falls, Montana. This must be an error, for that species is known 

 only from the eastern seaboard from southern Virginia to eastern 

 Texas. Aristida fasciculata Hookeri of Blankinship's list is the 

 same as A . longiseta. 



Professor Nelson reports Aristida oligantha from Colorado. I 

 have seen no specimens from that state and none from west of 

 central Nebraska. Perhaps A. hromoides might have been mis- 

 taken for it. 



The oldest available specific name for Eriocoma cuspidata is 

 hymenoides, which is therefore adopted, and its name and synonymy 

 is as follows: 



Eriocoma hymenoides (R. & S.) Rydb. comb. nov. 



Stipa membranacea Pursh, Fl. Am. Sept. 728. 1814. Not 5. 



membranacea L. 1753. 

 Stipa hymenoides R. & S. Syst. 2: 339. 181 7. 

 Eriocoma cuspidata Nutt. Gen. i: 40. 1818. 

 Oryzopsis cuspidata Benth. ; Vasey, Special Rep. U. S. Dept. Agr. 



63: 23. 1883. 



The following species of Muhlenbergia should be added to the 

 flora of the Rocky Mountain region: M. pauciflora Buckl. {M. 

 neomexicana Vasey; M. Pringlei Scribn.), M. polycaulis Scribn., 

 and M. curtifolia Scribn., which were collected by Professor A. O. 

 Garrett and myself in southeastern Utah last summer. Alope- 

 curus fulvus Smith is not found in America, except perhaps in 

 Greenland. A. aristulatus Michx. is not the same, differing not 

 only in the general habit, not being depressed-geniculate, but also 

 in the difi^erent position of the awn of the floral glume. Alopecurus 

 pallescens Piper has been collected in both Idaho and Montana. 



* J. G. Smith. Rep. Missouri Bot. Gard. 6: 32. 1894. 

 t Bull. Torrey Club 20: 283. 1893. 



