1898.] 



NATURAL SCIENCES OF PHILADELPHIA. 



45 



Zygadenus elegans Pursh. 



On the Cokalaishkit River, 

 July 7, 1806. 



Aira brevifolia Pursh. 



The most common grass 

 through the plains of Columbia 

 and near the Kooskooskee River, 

 June 10, 1806. Poa trivialis L., 

 var. [Fair specimen]. 



Hordeum jubatum L. 



Called the golden or silken 

 rye. On the White Bear Islands 

 on the Missouri, July 12, 1806. 



Hordeum jubatum L. 



Grass common to the open 

 grounds near Fort Clatsop. 

 March 13, 1806. 



Festuca ovina L. var. 



On the plains of Columbia. 

 June 10, 1806. 



Agropyron divergens Nees. 



On the plains of the Columbia, 

 June 10, 1806. (Determined by 

 Prof. Scribner). 



Koeleria cristata Pers. 



On the plains of the Columbia, 

 etc., June 10, 1806. 



Stipa spartea Trin. 



Valleys of the Missouri on the 

 Rocky Mountain, July 8, 1806. 

 {Stipa comata Trin. according to 

 Prof. Scribner). 



Pursh, Fl. 241. On the waters 

 of the Cokalaishkit River, near 

 the Rocky Mountains. M. Lewis. 

 % • July, v. s. in Herb. Lewis. 



Pursh, F1.76. In the plains of 

 the Missouri. M. Lewis. % . 

 June, July, v. s. iti Herb. Lewis. 

 This grass is the most common in 

 those plains. 36 



Pursh, Fl. 89. On the islands 

 of the Missouri River. M. Lewis. 

 $ . July, v. s. in Herb. Lewis and 

 Lambert. 



Pursh, Fl. 1. c. 



Festuca duriuscula Pursh, Fl. 

 83? [but Lewis' specimen not 

 mentioned]. 



Festuca spicata Pursh, Fl. 83. 

 On the waters of the Missouri 

 and Columbia Rivers, June, v. s. 

 in Herb. Lewis. 



Pursh, Fl. 85. On the plains 

 of the Columbia River. M. Lew- 

 is. 11 . July, v. s. in Herb. Lewis. 



Stipa juncea Pursh, (not L.), 

 Fl. 72. On the banks of the Mis- 

 souri. M.Lewis. %. Aug. v.s. 

 in Herb. Lewis. 



38 This seems to be the plant described by Pursh as Aira brevifolia, as 

 worked out by both Dr. Robinson and myself. But Professor Scribner, whose 

 authority on grasses cannot be disputed, decides these specimens to be Poa 

 tenuifolia Nutt., P. Buckleyana Nash. 



