POACEAE. 31 



4. Agrostis hiemalis (Walt.) B. S. P. (A. scahra Willd.) On prairies and 

 hills, both in dry and wet soil, from Lab. to Alaska, Fla. and Calif. ; also 

 in Mex. — Alt. 4000-11,000 ft, — ^Vicinity of Fort Collins; Baxter's ranch; 

 Poudre Canon; Twin Lakes; Taylor River; about Ouray; Gunnison; North 

 Cheyenne Caiion ; Ruxton Dell ; Pagosa Springs ; near Pagosa Peak ; near 

 Boulder; mountains between Sunshine and Ward; Cameron Pass; Estes 

 Park ; Grand Lake ; Hamor's Lake ; Grizzly Creek ; Georgetown ; mountains, 

 Larimer Co.; Marshall Pass; Valley and Empire; Veta Pass; Salida; Twin 

 Lakes ; South Park ; Como ; gulch west of Soldier Canon ; Little Beaver 

 Creek; between Graymont and Silver Plume; Steamboat Springs; Rabbit- 

 Ear Range. 



5. Agrostis tenuiculmis Nash. {A. tennis Vasey) In mountain meadows 

 from Mont, to Wash., Colo, and Calif. — Alt. 10,000-11,500 ft. — South Park; 

 Mt. Elbert; Dead Lake; near Pagosa Peak; summit of North Park Range, 

 Routt Co. 



6. Agrostis canina L. Along mountain brooks from Newf. and Alaska 

 to Pa., Colo, and Nev. — Alt. about 9000 ft. — Silver Plume. 



30. CALAMAGROSTIS Adans. Reed-grass, Blue-joint. 



Awn strongly geniculate, exserted, longer than the empty glumes ; callus-hairs 

 much shorter than the flowering glume ; panicle dense and spike-like. 



1. C. purpurascens. 



Avin straight or nearly so, included ; callus-hairs not much shorter than the flower- 

 ing glume (except in C. scopulorum) . 

 Panicle open, the lower branches wide-spreading and often drooping ; leaf- 

 blades flat ; callus-hairs copious, almost equalling the glume. 

 Spikelets 4-6 mm. long ; empty glumes narrow, sharply acuminate ; awn stout, 

 attached below the middle, considerably exceeding the glume. 



2. C. Langsdorffii. 

 Spikelets 3-4 mm. long, awn attached near the middle, equalling or slightly 



exceeding the glume. 3. C. canadensis. 



Panicle more or less contracted, branches ascending. 

 Leaf-blades flat or nearly so. 



Callus-hairs copious, Yi as long as the flowering glume or longer. 

 Plant cespitose ; empty glumes acute. 9. C. hyperborea elongata. 



Plant not cespitose ; empty glumes long-acuminate. 



4. C. Scribneri. 

 Callus-hairs sparse, 14 as long as the glume. 5. C. scopulorum. 

 Leaf-blades involute. 



Culm and the narrow leaf-blades soft, not rigid ; plant not cespitose. 

 Spikelets 2.5-4 ™m. long ; empty glumes thin, sharp-acuminate. 



6. C. neglecta. 

 Spikelets 2 mm. long; empty glumes thickish, barely acutish. 



7. C. micrantha. 

 Culm and the usually broader leaf-blades hard, more or less rigid. 



Plant not cespitose, tall ; panicle very long. 8. C. inexpansa. 

 Plant strongly cespitose ; panicle short and dense. 



9. C. hyperborea. 



I. Calamagrostis purpurascens R. Br. (Deyeu:ria sylvatica Vasey; not 

 DC.) On dry, stony hills and alpine table-lands from Greenl. to Alaska, 

 Colo, and Calif. — ^Alt. 6500-12,500 ft. — Silver Plume; mountains above Idaho 

 Springs; mountains between Sunshine and Ward; South Park; Mt. Ouray; 

 Mt. Garfield; Georgetown; Front Range, Larimer Co.; Webster; Pike's Peak; 



