104 Rydberg: Studies on the Rocky Mountain flora 



S. Wats.) in eastern Utah, Eragrostis lutescens Scribn. and E. 

 hypnoides Nees in Idaho, E. secundiflora Presl in Colorado, and E. 

 neoniexica?7a Vasey in southern Utah. Briza maxima L. has be- 

 come introduced in Colorado. 



Poa Midtnomae Piper and P. ampla Merrill have been collected 

 in Montana since 1909. Poa flava L. is not a Poa at all, as shown 

 by Professor A. S. Hitchcock, and the name to be used for P. 

 serotina Ehrh. is P. triflora Gilib. Poa laxa Haenke is not found 

 in the Rocky Mountains, and what has been masquerading under 

 that name is P. alpicola Nash. Poa paddensis Piper is an older 

 name for P. suhpurpiirea Rydb., both being based on P. purpuras- 

 cens Vasey. In the New Manual no reason is given why P. 

 BuckJeyana Nash, published in 1895, should be used instead of P. 

 Sandbergii Vasey of 1893. They may be the same. P. Buckleyana 

 Nash was a substitute for the untenable P. tenuifolia Buckl., while 

 P. Sandbergii was described independently. I have not seen 

 Buckley's type, but it is supposed to have been based upon the 

 manuscript P. tenuifolia Nutt. Dr. A. Gray accused Buckley of 

 having pilfered the species from Nuttall. There is in the her- 

 barium of the New York Botanical Garden a specimen named by 

 Nuttall P. tenuifolia, and this specimen belongs to P. Sandbergii. 

 What has usually passed under the names P. tenuifolia and P. 

 Buckleyana is different, and I think represents a distinct although 

 closely related species. The grass common in Wyoming and Colo- 

 rado belongs to this and not to the typical P. Sandbergii, which 

 ranges only Avest of the continental divide. 



Although Poa pseudopratensis Scribn. & Rydb. resembles the 

 common bluegrass in habit it is entirely distinct from it and more 

 closely related to P. arida Vasey. Like that species it lacks the 

 cobweb at the base of the floral glumes altogether, while P. 

 pratensis has the best developed cobweb of all our species. Like- 

 wise P. phoenicea Rydb., also cited as a synonym under P. praten- 

 sis in the New Manual, has no cobweb arid belongs in another 

 section of the genus. I am inclined to think that P. phoenicea 

 Rydb. is the same as the original P. Grayana Vasey, while P. 

 Grayana of my Flora of Colorado is a large-flowered P. Patter- 

 sonii or a closely related species. 



Poa crocata Michx. is the same as P. caesia strictior. In the 



