Rvdberg : Rocky Mountain flora 601 



Muhlenbergia Thurberi Rydb. 



Sporobolus filiculmis Vasey ; Beal, Grasses N. Am. 2 : 288. 1896. 



Not S. filiculmis Dewey. 1894. 

 Ufa filiculmis Thurber ; Beal, /. c, as a synonym. 



Both Sporobolus filiculmis Vasey and Vilfa filiculmis Thurber 

 appeared in 1885 in Vasey's Catalogue of the Grasses of United 

 States, on page 44 ; but both are there nomina nuda and the first 

 place where a description is published is, as far as I can find, in 

 Beal's Grasses of North America. In the meantime Dewey had 

 published another Sporobolus filiculmis which invalidates that 

 specific name. 



Sporobolus flexuosus (Thurber) Rydb. 



Sporobolus cryptandrus flexuosus Thurber ; Vasey, Bot. Wheeler 

 Surv. 282. 1878. 

 This is evidently specifically distinct from 5. cryptandrus. 



Deschampsia alpicola Rydb. sp. nov. 



Dcschampsia cacspilosa dlpina Vasey ; Beal, Grasses N. Am. 2 : 



368 ; at least in part. 1896. Not D. alpina R. & S. 18 17. 



Densely cespitose, tufted perennial ; sterile shoots numerous ; 

 sheaths 2-3 cm. long, glabrous, striate ; ligules linear-lanceolate, 

 acuminate, about 5 mm. long; blades 1-2 dm. long, 1-2 mm. 

 wide, stiff, often more or less involute ; culm-leaves with sheaths 

 1 — 1-5 dm. long and blades 1-4 cm. long; culms 3-5 dm. high; 

 panicle short, open, 8-15 cm. long, its branches in 2's to 5's, 

 3-6 cm. long, soon spreading ; spikelets about 5 mm. long ; 

 empty glumes about 4 mm. long, lanceolate, acute ; flowering 

 glume nearly as long, hirsute at the base ; awn attached one third 

 or one-fourth from the base, one and a half to two times as long 

 as the glume, bent and twisted. 



This differs from D. caespitosa in the large flowers and the long 

 awns. It has been mistaken for D. bo'tnica, but that species has 

 long narrow inflorescence and comparatively longer empty glumes. 

 D. alpicola is rather common in alpine regions of Colorado. A 

 similar if not identical form is aiso found in Alaska. As the type 

 may be designated : 



Colorado : Mountain meadows, Pike's Peak, Sept. 4, 1901, 

 at an altitude of 3600 meters, L. M. Underwood XX. 



