36 



lateral nerves rather sJwrt, inconspicuous and sometimes irariting ; the upper 7-9 mm. 

 long, distinctly 3-nerved, obtuse; flowering glume 11-13 mm. long, broad- 

 lanceolate, rather coarsely pubescent, apex hyaline, entire, or slightly emargi- 

 nate; awn 2-4 mm. long, inserted just below the apex; palea mostly slightly 

 - shorter than its glume. 

 Type: The following specimens are cited with the original description 1 c. "Colo- 

 rado, at Twin Lakes (Porter) , Buffalo Peaks, and Sierra Madre Range (Coulter) ." 

 Specimens from both the collections referred to have been seen and the above 

 description based on them. 



General distribution: Arizona and New Mexico north to Manitoba and west to 



Alberta. Found in its most 

 characteristic form in the 

 Rocky Mountains at an al- 

 titude of 2-3000 meters. 

 Specimens examined. — Arizo- 

 na: Huachuca Mountains 

 (F. X. Holzner 2164); a 

 large form not typical; 

 Tucson (J. W. Tourney). 

 New Mexico: Glorietta (G. 

 R. Vasey) . Co I o r ado: 

 Steamboat Springs (Alice 

 Eastwood 20) ; M a n c o s 

 (Tracy, Earle & Baker 104, 

 382, 432) ; Silverton (C. L. 

 Shear 1216) ; West Mancos 

 Canyon (Tracy, Earle & 

 Baker 332); Fort Collins 

 Gulch (L. H. Pammel); 

 North Park (C. F. Baker 

 24, 49; C. S. Sheldon 177); 

 Sheep Horn Divide (Shear 

 & Bessey 1540) ; Red Dirt 

 Divide, Routt County 

 (Shear & Bessey 1350, 

 1355) ; Marshall Pass(S. M. 

 Tracy 459; C. L. Shear 934) ; 

 Garland (C. L. Shear 854; 

 G. Vasey) ; Crested Butte 

 (Alice Eastwood 10a) ; Rob- 

 inson (C. L. Shear 1054); 

 Durango (Tracy, Earle & 

 Baker 986, 4302)'; West Cliff 

 (C. L. Shear 993); Twin 

 Lakes (John Wolfe 1 155-(5) ; 

 Gunnison (S. M. Tracy 

 442) , Harmons Lake (Tracy, Earle & Baker 4300). l't<ih: Fish Lake(^L E. Jones 

 5743) ; P>n)mide Pass (M. E. Jones 5699bb) ; Above Kings Meadows (L. F. Ward 

 313); Cashe Junction (C). L. Shear 597); Aquarius Plateau (L. F. Ward 431). 

 Wyominf/: Sundance (Griffiths 420, 423, 436, 946; T. A. Williams 2604) ; Little INIis- 

 souri Buttes (D. Grifiiths 5S4) ; Bear Lodge Mountains (T. A. Williams 2642) ; Wind 

 River ( W. H. Forwood) ; Evanston(G. W. Letterman3; T. A. Williams2395, 2424) ; 

 Klk Mountain (A. Nelson 4083) ; Gros Ventre (F. Tweedy 66) ; Woods Landing ( A. 

 Nelson 3922, 3848); Meeteetse Creek (T. A. Williams 2879); Spread Creek (F. 



Fig. 19. — IJroinus purUri : u, empty glumes with two florets 

 /), dorsal view of a flowering glume. 



